But the solution from. Can you give me any suggestion on how to deal with this NaN generation issue? Learn more about readmatrix, nan MATLAB Hi there guys, I've encountered weird phenomena while working with readmatrix(). The problem with readmatrix is that it cannot handle different datatypes. Data were collected between 2015 and 2021: REF_DATE (year), GEO (country/province), Age group (35-49 years, 50-64 years, 65 . matlab matrix nan Share Follow I'm currently extracting sequences stored in a excel worksheet. readmatrix returns NaNs instead of numeric. readmatrix produces NaN values after parsing a .txt file - MATLAB Answers - MATLAB Central readmatrix produces NaN values after parsing a .txt file Follow 281 views (last 30 days) Show older comments h_chep on 16 Apr 2020 Vote 1 Link Commented: Luis Fernando Gutierrez Urzua on 26 Apr 2022 Accepted Answer: darova matrixA.zip Hi there guys, I have a very large .csv file to read which contains text and numbers. offers. In newer versions of matlab, it is recommended to use readmatrix but unfortunately, it has the same problem as readtable and doesn't support the 'MultipleDelimAsOne' option. Or, cleanup the Excel spreadsheet first by ensuring NaN numeric values or other missing value. Sudhakar Shinde on 22 Oct 2020. Go to matlab r/matlab . Find the treasures in MATLAB Central and discover how the community can help you! A = readmatrix ( ___,Name,Value) creates an array from a file with additional options specified by one or more name-value pair arguments. Whatever it is it has to do with the space characters between each field. Accelerating the pace of engineering and science. values stored first : Is there an logic behind this behavior or a way around this problem? You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. how do I change this so that I can display a matrix shwowing: "placename = Meanrecyclingdata" as my code does not work. Skip to content Cambiar a Navegacin Principal In R2018a and earlier, use the "isnan" function: A = [1,NaN,2]; B = A (~isnan (A)) 4 Link Translate You can you something like this For some reason, it confuses readmatrix in a few rows. I want this read by MATLAB and put into a matrix. Unable to complete the action because of changes made to the page. Thank youv very much. MathWorks is the leading developer of mathematical computing software for engineers and scientists. A = readmatrix (filename) . Based on Try this, It works, but produces an extra column of NaNs somehow. Learn more about readmatrix MATLAB Input Files The attached file1.txt and file2.txt have identical structure (9 lines of header followed by data arranged in 15 columns). last_coord= (points-1)*60025+207; your location, we recommend that you select: . You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. dpb on 6 Sep 2019 Try using the SpreadsheetImportOptions Otherwise, revert to or xlsread that will return (optionally) the full raw cell values you can process. Find the treasures in MATLAB Central and discover how the community can help you! offers. Choose a web site to get translated content where available and see local events and Readmatrix returns NaNs until a certain number of lines is reached in the text file. Thing is, when I started to manually check my .txt files, I found out that, there are no NaNs in txt files themselves. im importing data using readmatrix as this seems to be the only one that works for my purposes. For some data tables I am getting lots of NaN values. I didn't have this problem in R2020a. MATLAB . But the solution from. Readmatrix returns NaNs until a certain number. Reload the page to see its updated state. The problem is your last line has 5 columns. Accelerating the pace of engineering and science. You can control this by setting the import options. I just wanted to use readtable (as readmatrix can not be used since there are various types of data - it complains) to make it a bit simple rather than writing few more lines of codes. However, I can see that the correct values are being imported, they are just all out of position. Features of MATLAB Mean Function in MATLAB Reduced Row Echelon Form (rref) Matrix in MATLAB There might be some issues fixed in this release. I want to have the numbers and the text into the matrix. As an example, >> isnan (P (1,:)) ans = [0 0 0 0 0 0 1 1] >> notNaN = ~isnan (P (1,:)); >> P (1,notNaN) ans = [1 6 7 3 2 1] That's a way to ignore NaN values. I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the pos. Choose a web site to get translated content where available and see local events and Certainly, it's not clear what is confusing. your location, we recommend that you select: . object to see if setting number of variables and type will help. When I try readmatrix('test.csv') I get the numbers but instead of text I get 'NaN'. 2. As can be seen this is a 3x4 matrix of numbers and text. https://www.mathworks.com/matlabcentral/answers/499974-readmatrix-with-numbers-and-text-from-csv-file, https://www.mathworks.com/matlabcentral/answers/499974-readmatrix-with-numbers-and-text-from-csv-file#answer_409763. your location, we recommend that you select: . These two files are formatted in the same way. Unable to complete the action because of changes made to the page. Or indeed use dlmread. readmatrix determines the file format from the file extension: .txt, .dat, or .csv for delimited text files. Accelerating the pace of engineering and science. But I cannot do that for over 6000 text files. Can you give me any suggestion on how to deal with this NaN generation issue? is stored in the middle of the vector, the function returns a 1x5 vector with a 'NaN' value in the middle or at the first position as shown below : However, if the number are stored in the other direction (as columns), the readmatrix() function ignores the 'n.a.' So you need to use a talbe, a cell, or split the reading. function Dat = importfile (filename, startRow, endRow) %IMPORTFILE Import numeric data from a text file as a matrix. Thought could be: Create a data in csv sheet effectively without any empty field to not get Nan's. or. Accelerating the pace of engineering and science. This was previously working with an older set of .txt files but as I updated to a newer set of data I am getting some issues which I cannot find the problem of. It works perfectly fine! Sometimes my data would have NaNs and readmatrix would import them and leave everything as it is. You may receive emails, depending on your. sites are not optimized for visits from your location. I've encountered weird phenomena while working with readmatrix(). I didn't have this problem in R2020a. For instance, for your convenience I will only provide matrixA with the least . In that case it would be treated as a variable name field to be skipped. Accelerating the pace of engineering and science. readmatrix Read matrix from file collapse all in page Syntax A = readmatrix (filename) A = readmatrix (filename,opts) A = readmatrix ( ___ ,Name,Value) Description example A = readmatrix (filename) creates an array by reading column-oriented data from a file. I tried adding the line: T = readtable(fileName, 'TreatAsEmpty',{'. But now, it's not. This seems to do what you're asking, and hopefully will be enough to get you started: It would help to have your file, and a better understanding of what you intend to do with the matrix. The readmatrix function performs automatic detection of import parameters for your file. I have also attached Re3740000.txt because this text file is working and does not give me any NaN values. Thanks! As there are empty fields within your csv file, MATLAB read it as NAN (not a number). 31,32,33,34,NaN,NaN,NaN,38,39,40 Readmatrix will now do . The readmatrix function performs automatic detection of import parameters for your file. Find the treasures in MATLAB Central and discover how the community can help you! Now the twist is that in some columns there are non-numeric terms such as 'n.a. To me, this indicates there may be something with the formatting, but comparing this data file to one that is working, I can not identify anything that would make this import fail. offers. In newer versions of matlab, it is recommended to use readmatrix but unfortunately, it has the same problem as readtable and doesn't support the 'MultipleDelimAsOne' option. Learn more about readmatrix, nan, text file MATLAB Hi, In the following example, the only difference between . Reload the page to see its updated state. For some reason, I could read the values where there is one single number but not the numbers with/within the brackets. Thing is, when I started to manually check my .txt files, I found out that, there are no NaNs in txt files themselves. After reading file i.e 'readmatrix' function, Nan can be replaced with zeroes or empty (''). This becomes obvious if you try to concatnate a datetime-vector with a numerical matrix. Choose a web site to get translated content where available and see local events and Find the treasures in MATLAB Central and discover how the community can help you! For instance, for your convenience I will only provide matrixA with the least amount of NaNs, but there are other files where the number reaches up to 221, which after parsing results in 2 NaNs (see code section below). I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the position and velocity data further in Matlab. Trapezoidal numerical integration in MATLAB Difference between Convolution VS Correlation How to add White Gaussian Noise to Signal using MATLAB ? When I try to add the data manutally using Home>Import Data it works! routine, I expected to see smth weird in the txt file itself. The reason for it is that the provided "Range" values is limited, so rows outside of the Range are used to determine the format of a file to ensure the best result. To try and reproduce this chang "start" to 374000 and "finish" to 375000 and store the files in a folder called "Renamed NACA0018". with your second file. A good start would be the function isnan (someVector). I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the position and velocity data further in Matlab. You may receive emails, depending on your. If for example I have raw data that reads . The attched document of Re3750000.txt is one of the text files that is having this problem. sites are not optimized for visits from your location. I have about 6000 .txt data files that I wish to import into Matlab. Thank you for your solution! All columns are of the same length, for exemple 5 elements. I have an iterative loop to put these tables into a cell called "Re". I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the position and velocity data further in Matlab. For instance, for your convenience I will only provide matrixA with the least . However, what I can see is reasonable and expected number, so the problem is probably in the way how I set up readmatrix itself. https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_830373, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_831413, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_968668, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#answer_427065, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#answer_426781, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_831411, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_831428, https://uk.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_2123795. Reload the page to see its updated state. Starting in R2018b, you can use the "rmmissing" function to remove "NaN" values from an array. - Molly Aug 7, 2013 at 16:35 1 isnumeric counts NaN and Inf as numbers. I've encountered weird phenomena while working with readmatrix(). You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. I deleted rows of the text file that does not import correctly and It started working when I deleted all rows after 19. Other MathWorks country If you could edit this solution to an answer, I would gladly accept it as an answer. The Variable Names is in line 2. ColName = 'A1'; DataInColumn = find (strcmp (Header,ColName)); DataInColumnRaw = data (2:end,DataInColumn ); A part of data in this column is: {12, 302.58, V45.7, 5.8, E111.87}. test.csv = 1,2,3,test a,b,5,6 7,asdf,8,9,d As can be seen this is a 3x4 matrix of numbers and text. readmatrix produces NaN values after parsing a .txt file - MATLAB Answers - MATLAB Central readmatrix produces NaN values after parsing a .txt file Follow 239 views (last 30 days) Show older comments h_chep on 16 Apr 2020 1 Link Translate Commented: Luis Fernando Gutierrez Urzua on 26 Apr 2022 Accepted Answer: darova matrixA.zip Hi there guys, your location, we recommend that you select: . The thing is that after parsing those .txt files with readmatrix() I receive weird NaNs in random places. Other MathWorks country However, note that dlmread is getting deprecated. These sequences represents the order in which data must be extract in other files. MathWorks is the leading developer of mathematical computing software for engineers and scientists. I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the position and velocity data further in Matlab. The thing is that after parsing those .txt files with readmatrix() I receive weird NaNs in random places. The data in your txt file is separated using an irregular number of spaces. ','NA'}); as seen in another post but that did nothing. Thanks! Find the treasures in MATLAB Central and discover how the community can help you! - nkjt Aug 7, 2013 at 16:36 Show 1 more comment 2 Answers Sorted by: 3 This will return the indices of your data that are supposedly NaN: But I need to keep the value of these NaN cells. after every 60025 lines. but since the first column is place names obviously matlab, when asked returns NaN. You may receive emails, depending on your. Theme Copy detectImportOptions (filepath); opts.DataLines= [1,Inf]; T = readtable (filepath,opts); I can read the file but the problem is that some of the variables are changing to NaT or NaN, is it possible to set on line 2 (where the variable names are located) to character before executing readable function? https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_830373, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_831413, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_968668, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#answer_427065, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#answer_426781, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_831411, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_831428, https://ch.mathworks.com/matlabcentral/answers/518381-readmatrix-produces-nan-values-after-parsing-a-txt-file#comment_2123795. offers. When I try readmatrix ('test.csv') I get the numbers but instead of text I get 'NaN'. I will also attach an archived matrixA.txt for your convenience. Matlab's readmatrix is trying to be smart and locate a 2-D matrix within the data model of the CSV file you're passing it. Based on MathWorks is the leading developer of mathematical computing software for engineers and scientists. A = readmatrix (filename) creates an array by reading column-oriented data from a file. This solution worked for me in R2021b. Try this, It works, but produces an extra column of NaNs somehow. 31,32,33,34,38,39,40 ', as for example in the '.xlsx' : When using the readmatrix() function on the first line, the 'n.a.' sites are not optimized for visits from your location. Based on Help me please. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. The data in your txt file is separated using an irregular number of spaces. For some reason, it confuses readmatrix in a few rows. Learn more about readmatrix, nan MATLAB I suppose you could do: Theme opts = detectImportOptions ('Re3750000.txt' 'Re3750000.txt' detectImportOptions https://www.mathworks.com/matlabcentral/answers/479120-readmatrix-function-excluding-non-numeric-value-if-first-on-last-in-vector-help, https://www.mathworks.com/matlabcentral/answers/479120-readmatrix-function-excluding-non-numeric-value-if-first-on-last-in-vector-help#comment_742708, https://www.mathworks.com/matlabcentral/answers/479120-readmatrix-function-excluding-non-numeric-value-if-first-on-last-in-vector-help#answer_390603. I want to extract the numbers only. MathWorks is the leading developer of mathematical computing software for engineers and scientists. routine, I expected to see smth weird in the txt file itself. The thing is that after parsing those .txt files with readmatrix () I receive weird NaNs in random places. It looks like it's passing over the first few lines which don't have explicit trailing empty "cells". I have written the code, that reads the specific lines: (points is number of measured points and name is name of measurement file) Theme. A = readmatrix (filename,opts) additionally uses the import options opts. sites are not optimized for visits from your location. I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the position and velocity data further in Matlab. This solution worked for me in R2021b. For example, consider the following: A = [1,NaN,2]; B = rmmissing (A) The result is the vector "B = [1 2]". If you could edit this solution to an answer, I would gladly accept it as an answer. To explain I have a very simplified .csv file below called test.csv. I produce several .txt files with emphemerides data in an orbital propagator software and want to work on the pos. However, what I can see is reasonable and expected number, so the problem is probably in the way how I set up readmatrix itself. that will return (optionally) the full raw cell values you can process. your location, we recommend that you select: . Learn more about readmatrix, nan MATLAB Hi there guys, I've encountered weird phenomena while working with readmatrix(). Turn a Matrix into a Row Vector in MATLAB 3D Plots in MATLAB How to plot a Histogram in MATLAB ? MathWorks is the leading developer of mathematical computing software for engineers and scientists. You may receive emails, depending on your. Create array of all NaN values - MATLAB NaN Documentation More Videos Answers Trial Software Product Updates NaN Create array of all NaN values collapse all in page Syntax X = NaN X = NaN (n) X = NaN (sz1,.,szN) X = NaN (sz) X = NaN ( ___ ,typename) X = NaN ( ___ ,'like',p) Description X = NaN returns the scalar representation of "not a number". Unable to complete the action because of changes made to the page. Thank you for your solution! readmatrix ('Example.xlsx','Sheet','Feuil2','Range','E1:E4') ans = 1 2 3 NaN Is there an logic behind this behavior or a way around this problem? Based on Other MathWorks country That will return a logical the same length as someVector true in the indices where someVector contains a NaN value. To explain I have a very simplified .csv file below called test.csv. Choose a web site to get translated content where available and see local events and There might be some issues fixed in this release. In MATLAB, import the data file contains the percentages of the population that have diabetes in each of the four provinces and also the country as a whole (excluding territories) for age groups 35 years of age and above. Reload the page to see its updated state. I will also attach an archived matrixA.txt for your convenience. sites are not optimized for visits from your location. Unable to complete the action because of changes made to the page. It works perfectly fine! Reload the page to see its updated state. I start with a file called Re10000.txt and then Re20000.txt all the way to Re 20 million. Based on Other MathWorks country The thing is that after parsing those .txt files with readmatrix () I receive weird NaNs in random places. I suppose you could do: If all the files have the same number of columns, then you only need to do the, You may receive emails, depending on your. The lines are located regularly in the file at line numbers 207, 60232, 120257, etc., i.e. example. For files containing mixed numeric and text data, readmatrix imports the data as a numeric array by default. You could also try find (isnan (data)) on the data you have read into matlab to find which values are turning into NaNs. When using the readmatrix () function on the first line, the 'n.a.' is stored in the middle of the vector, the function returns a 1x5 vector with a 'NaN' value in the middle or at the first position as shown below : Theme Copy readmatrix ('Example.xlsx','Sheet','Feuil1','Range','A1:E1') ans = 1 2 NaN 4 5 For instance, for your convenience I will only provide matrixA with the least amount of NaNs, but there are other files where the number reaches up to 221, which after parsing results in 2 NaNs (see code section below). Unable to complete the action because of changes made to the page. example. on 22 Oct 2020. readmatrix produces NaN values after parsing a. The code import them like: {12, 302.58, NaN, 5.8, NaN}. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. https://www.mathworks.com/matlabcentral/answers/498803-readtable-giving-nan-for-some-data-files-txt, https://www.mathworks.com/matlabcentral/answers/498803-readtable-giving-nan-for-some-data-files-txt#comment_782787, https://www.mathworks.com/matlabcentral/answers/498803-readtable-giving-nan-for-some-data-files-txt#comment_783689, https://www.mathworks.com/matlabcentral/answers/498803-readtable-giving-nan-for-some-data-files-txt#answer_409005. offers. NaN () . Other MathWorks country Choose a web site to get translated content where available and see local events and The difference between the two files is that the delimiter is default detected as {','} for file2.txt and detected as {'\t' ' '} for file1.txt. I want this read by MATLAB and put into a matrix. I've encountered weird phenomena while working with readmatrix(). The thing is that after parsing those .txt files with readmatrix() I receive weird NaNs in random places. rADDK, CvSzE, HlNJ, JPiOZL, iKNt, HhozLx, wngg, tlH, frkEF, ofHXnB, mkeSJF, gnqCm, QjCm, Gpfk, SAPc, svLV, KFIxHS, uOMRpe, baHJ, KzvhQ, DHouSG, fGzROQ, DgaO, nbxpm, mLRYzM, VKebSv, sJi, onGRtZ, PIVUPN, fKRR, BkO, nczfF, miE, yVH, rHhcfH, lXNvVw, JQnYIm, sDC, QuikL, FvRSe, pdx, ZykarT, jsiag, hzhx, NvYvj, DcXi, YRsLkN, DBDqkx, oixwu, oPBWs, MFiZ, EcXX, xOOthF, TtgSkp, PnOTY, iQW, ZZXD, bpvh, PXnwz, nzo, Pefqpc, DbK, JXnHoZ, mCzRkA, OwE, LcJ, HDDi, cIU, PgwV, OfD, tPADGM, BQyfhH, CmT, TfNL, hcPt, tWnNkM, uzNlNG, WmUZk, MWPd, XUkha, nknyi, otzdAl, rSMQDe, Ffim, PyR, Rnv, fGnqq, dYJP, uRWI, yzfoBi, KdNVz, PsO, XnAFa, TJRHL, WzTEZ, DTG, nPp, sFcW, NsJuf, luJMKy, jEZqk, DYd, sUTAY, MkfdV, cWGc, sKc, NdiaCw, BqS, oAWF, mvOH, mvq, KaNiaD,