cell2table is not recognizing certain columns (not all) containing double data

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Praveen N
Praveen N le 16 Mai 2021
Commenté : Star Strider le 17 Mai 2021
I am trying to write a table to create a .csv file. I did the following when I faced this issue.
data = readcell('S.csv'); %Attached below with this Question
b = cell2table(data(:,3:5)); %Want these columns of the input data to be written to another file
% First column in "b" just contained empty cells
writetable(b,'data.csv');%Look into attachments
If anybody does have an idea about what's wrong here, kindly share with me about the workaround tricks to do this.
Thanks
  2 commentaires
the cyclist
the cyclist le 16 Mai 2021
Is there a reason you did not do the simpler:
data = readtable('S.csv');
writetable(data(:,3:5),'data.csv');
Praveen N
Praveen N le 17 Mai 2021
How can I avoid matlab renaming the column names ? I want them to be preserved as they were in original file. That is the reason why I am using readcell instead of readtable. readtable is detecting the first row as variable names and making them unique by modifying original column names. Any tricks to avoid it ?

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Star Strider
Star Strider le 16 Mai 2021
Ran in:
I am not certain what the problem is with readcell, however unless it is absolutely necessary to use it, use readtable instead, with corresponding changes in creating ‘b’.
data = readcell('https://www.mathworks.com/matlabcentral/answers/uploaded_files/619743/S.csv') %Attached below with this Question
data = 1002×17 cell array
{'fm' } {'sm' } {'sm' } {'f' } {'s1' } {'s1' } {'s1' } {'fm' } {'sm' } {'sm' } {'sm' } {'sm' } {'f' } {'s1' } {'s1' } {'s1' } {'s1' } {[ 2]} {[ -3.8175]} {[ -3.8175]} {[ 2]} {[-1.3884]} {[-1.3884]} {[-1.3884]} {[ 2]} {[ -3.8175]} {[ -3.8175]} {[ -3.8175]} {[ -3.8175]} {[ 2]} {[-1.3884]} {[-1.3884]} {[-1.3884]} {[-1.3884]} {[2.0400]} {[ -4.1535]} {[ -4.1535]} {[2.0050]} {[-1.4146]} {[-1.4146]} {[-1.4146]} {[2.0400]} {[ -4.1535]} {[ -4.1535]} {[ -4.1535]} {[ -4.1535]} {[2.0050]} {[-1.4146]} {[-1.4146]} {[-1.4146]} {[-1.4146]} {[2.0800]} {[ -4.6785]} {[ -4.6785]} {[2.0100]} {[-1.4433]} {[-1.4433]} {[-1.4433]} {[2.0800]} {[ -4.6785]} {[ -4.6785]} {[ -4.6785]} {[ -4.6785]} {[2.0100]} {[-1.4433]} {[-1.4433]} {[-1.4433]} {[-1.4433]} {[2.1200]} {[ -5.7046]} {[ -5.7046]} {[2.0150]} {[-1.4746]} {[-1.4746]} {[-1.4746]} {[2.1200]} {[ -5.7046]} {[ -5.7046]} {[ -5.7046]} {[ -5.7046]} {[2.0150]} {[-1.4746]} {[-1.4746]} {[-1.4746]} {[-1.4746]} {[2.1600]} {[ -7.4639]} {[ -7.4639]} {[2.0200]} {[-1.5086]} {[-1.5086]} {[-1.5086]} {[2.1600]} {[ -7.4639]} {[ -7.4639]} {[ -7.4639]} {[ -7.4639]} {[2.0200]} {[-1.5086]} {[-1.5086]} {[-1.5086]} {[-1.5086]} {[2.2000]} {[-10.3309]} {[-10.3309]} {[2.0250]} {[-1.5454]} {[-1.5454]} {[-1.5454]} {[2.2000]} {[-10.3309]} {[-10.3309]} {[-10.3309]} {[-10.3309]} {[2.0250]} {[-1.5454]} {[-1.5454]} {[-1.5454]} {[-1.5454]} {[2.2400]} {[-13.7420]} {[-13.7420]} {[2.0300]} {[-1.5852]} {[-1.5852]} {[-1.5852]} {[2.2400]} {[-13.7420]} {[-13.7420]} {[-13.7420]} {[-13.7420]} {[2.0300]} {[-1.5852]} {[-1.5852]} {[-1.5852]} {[-1.5852]} {[2.2800]} {[-16.5223]} {[-16.5223]} {[2.0350]} {[-1.6281]} {[-1.6281]} {[-1.6281]} {[2.2800]} {[-16.5223]} {[-16.5223]} {[-16.5223]} {[-16.5223]} {[2.0350]} {[-1.6281]} {[-1.6281]} {[-1.6281]} {[-1.6281]} {[2.3200]} {[-17.6208]} {[-17.6208]} {[2.0400]} {[-1.6743]} {[-1.6743]} {[-1.6743]} {[2.3200]} {[-17.6208]} {[-17.6208]} {[-17.6208]} {[-17.6208]} {[2.0400]} {[-1.6743]} {[-1.6743]} {[-1.6743]} {[-1.6743]} {[2.3600]} {[-17.3200]} {[-17.3200]} {[2.0450]} {[-1.7238]} {[-1.7238]} {[-1.7238]} {[2.3600]} {[-17.3200]} {[-17.3200]} {[-17.3200]} {[-17.3200]} {[2.0450]} {[-1.7238]} {[-1.7238]} {[-1.7238]} {[-1.7238]} {[2.4000]} {[-14.9784]} {[-14.9784]} {[2.0500]} {[-1.7769]} {[-1.7769]} {[-1.7769]} {[2.4000]} {[-14.9784]} {[-14.9784]} {[-14.9784]} {[-14.9784]} {[2.0500]} {[-1.7769]} {[-1.7769]} {[-1.7769]} {[-1.7769]} {[2.4400]} {[-12.5270]} {[-12.5270]} {[2.0550]} {[-1.8337]} {[-1.8337]} {[-1.8337]} {[2.4400]} {[-12.5270]} {[-12.5270]} {[-12.5270]} {[-12.5270]} {[2.0550]} {[-1.8337]} {[-1.8337]} {[-1.8337]} {[-1.8337]} {[2.4800]} {[-10.0090]} {[-10.0090]} {[2.0600]} {[-1.8943]} {[-1.8943]} {[-1.8943]} {[2.4800]} {[-10.0090]} {[-10.0090]} {[-10.0090]} {[-10.0090]} {[2.0600]} {[-1.8943]} {[-1.8943]} {[-1.8943]} {[-1.8943]} {[2.5200]} {[ -7.9086]} {[ -7.9086]} {[2.0650]} {[-1.9589]} {[-1.9589]} {[-1.9589]} {[2.5200]} {[ -7.9086]} {[ -7.9086]} {[ -7.9086]} {[ -7.9086]} {[2.0650]} {[-1.9589]} {[-1.9589]} {[-1.9589]} {[-1.9589]} {[2.5600]} {[ -6.6341]} {[ -6.6341]} {[2.0700]} {[-2.0276]} {[-2.0276]} {[-2.0276]} {[2.5600]} {[ -6.6341]} {[ -6.6341]} {[ -6.6341]} {[ -6.6341]} {[2.0700]} {[-2.0276]} {[-2.0276]} {[-2.0276]} {[-2.0276]}
b = cell2table(data(:,3:5)) %Want these columns of the input data to be written to another file
b = 1002×3 table
Var1 Var2 Var3 ____________ ____ ___________ {'sm' } f {'s1' } {[ -3.8175]} {[-1.3884]} {[ -4.1535]} {[-1.4146]} {[ -4.6785]} {[-1.4433]} {[ -5.7046]} {[-1.4746]} {[ -7.4639]} {[-1.5086]} {[-10.3309]} {[-1.5454]} {[-13.7420]} {[-1.5852]} {[-16.5223]} {[-1.6281]} {[-17.6208]} {[-1.6743]} {[-17.3200]} {[-1.7238]} {[-14.9784]} {[-1.7769]} {[-12.5270]} {[-1.8337]} {[-10.0090]} {[-1.8943]} {[ -7.9086]} {[-1.9589]} {[ -6.6341]} {[-2.0276]}
data2 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/619743/S.csv') %Attached below with this Question
data2 = 1001×17 table
fm sm sm_1 f s1 s1_1 s1_2 fm_1 sm_2 sm_3 sm_4 sm_5 f_1 s1_3 s1_4 s1_5 s1_6 ____ _______ _______ _____ _______ _______ _______ ____ _______ _______ _______ _______ _____ _______ _______ _______ _______ 2 -3.8175 -3.8175 2 -1.3884 -1.3884 -1.3884 2 -3.8175 -3.8175 -3.8175 -3.8175 2 -1.3884 -1.3884 -1.3884 -1.3884 2.04 -4.1535 -4.1535 2.005 -1.4146 -1.4146 -1.4146 2.04 -4.1535 -4.1535 -4.1535 -4.1535 2.005 -1.4146 -1.4146 -1.4146 -1.4146 2.08 -4.6785 -4.6785 2.01 -1.4433 -1.4433 -1.4433 2.08 -4.6785 -4.6785 -4.6785 -4.6785 2.01 -1.4433 -1.4433 -1.4433 -1.4433 2.12 -5.7046 -5.7046 2.015 -1.4746 -1.4746 -1.4746 2.12 -5.7046 -5.7046 -5.7046 -5.7046 2.015 -1.4746 -1.4746 -1.4746 -1.4746 2.16 -7.4639 -7.4639 2.02 -1.5086 -1.5086 -1.5086 2.16 -7.4639 -7.4639 -7.4639 -7.4639 2.02 -1.5086 -1.5086 -1.5086 -1.5086 2.2 -10.331 -10.331 2.025 -1.5454 -1.5454 -1.5454 2.2 -10.331 -10.331 -10.331 -10.331 2.025 -1.5454 -1.5454 -1.5454 -1.5454 2.24 -13.742 -13.742 2.03 -1.5852 -1.5852 -1.5852 2.24 -13.742 -13.742 -13.742 -13.742 2.03 -1.5852 -1.5852 -1.5852 -1.5852 2.28 -16.522 -16.522 2.035 -1.6281 -1.6281 -1.6281 2.28 -16.522 -16.522 -16.522 -16.522 2.035 -1.6281 -1.6281 -1.6281 -1.6281 2.32 -17.621 -17.621 2.04 -1.6743 -1.6743 -1.6743 2.32 -17.621 -17.621 -17.621 -17.621 2.04 -1.6743 -1.6743 -1.6743 -1.6743 2.36 -17.32 -17.32 2.045 -1.7238 -1.7238 -1.7238 2.36 -17.32 -17.32 -17.32 -17.32 2.045 -1.7238 -1.7238 -1.7238 -1.7238 2.4 -14.978 -14.978 2.05 -1.7769 -1.7769 -1.7769 2.4 -14.978 -14.978 -14.978 -14.978 2.05 -1.7769 -1.7769 -1.7769 -1.7769 2.44 -12.527 -12.527 2.055 -1.8337 -1.8337 -1.8337 2.44 -12.527 -12.527 -12.527 -12.527 2.055 -1.8337 -1.8337 -1.8337 -1.8337 2.48 -10.009 -10.009 2.06 -1.8943 -1.8943 -1.8943 2.48 -10.009 -10.009 -10.009 -10.009 2.06 -1.8943 -1.8943 -1.8943 -1.8943 2.52 -7.9086 -7.9086 2.065 -1.9589 -1.9589 -1.9589 2.52 -7.9086 -7.9086 -7.9086 -7.9086 2.065 -1.9589 -1.9589 -1.9589 -1.9589 2.56 -6.6341 -6.6341 2.07 -2.0276 -2.0276 -2.0276 2.56 -6.6341 -6.6341 -6.6341 -6.6341 2.07 -2.0276 -2.0276 -2.0276 -2.0276 2.6 -5.6447 -5.6447 2.075 -2.1005 -2.1005 -2.1005 2.6 -5.6447 -5.6447 -5.6447 -5.6447 2.075 -2.1005 -2.1005 -2.1005 -2.1005
b2 = data2(:,3:5)
b2 = 1001×3 table
sm_1 f s1 _______ _____ _______ -3.8175 2 -1.3884 -4.1535 2.005 -1.4146 -4.6785 2.01 -1.4433 -5.7046 2.015 -1.4746 -7.4639 2.02 -1.5086 -10.331 2.025 -1.5454 -13.742 2.03 -1.5852 -16.522 2.035 -1.6281 -17.621 2.04 -1.6743 -17.32 2.045 -1.7238 -14.978 2.05 -1.7769 -12.527 2.055 -1.8337 -10.009 2.06 -1.8943 -7.9086 2.065 -1.9589 -6.6341 2.07 -2.0276 -5.6447 2.075 -2.1005
.
  2 commentaires
Praveen N
Praveen N le 17 Mai 2021
How can I avoid matlab renaming the column names ? I want them to be preserved as they were in original file. That is the reason why I am using readcell instead of readtable. readtable is detecting the first row as variable names and making them unique by modifying original column names. Any tricks to avoid it ?
Star Strider
Star Strider le 17 Mai 2021
Ran in:
One way is to use 'VariableNamingRule','preserve', for example with this file —
data2 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/619743/S.csv','VariableNamingRule','preserve')
data2 = 1001×17 table
fm sm sm_1 f s1 s1_1 s1_2 fm_1 sm_2 sm_3 sm_4 sm_5 f_1 s1_3 s1_4 s1_5 s1_6 ____ _______ _______ _____ _______ _______ _______ ____ _______ _______ _______ _______ _____ _______ _______ _______ _______ 2 -3.8175 -3.8175 2 -1.3884 -1.3884 -1.3884 2 -3.8175 -3.8175 -3.8175 -3.8175 2 -1.3884 -1.3884 -1.3884 -1.3884 2.04 -4.1535 -4.1535 2.005 -1.4146 -1.4146 -1.4146 2.04 -4.1535 -4.1535 -4.1535 -4.1535 2.005 -1.4146 -1.4146 -1.4146 -1.4146 2.08 -4.6785 -4.6785 2.01 -1.4433 -1.4433 -1.4433 2.08 -4.6785 -4.6785 -4.6785 -4.6785 2.01 -1.4433 -1.4433 -1.4433 -1.4433 2.12 -5.7046 -5.7046 2.015 -1.4746 -1.4746 -1.4746 2.12 -5.7046 -5.7046 -5.7046 -5.7046 2.015 -1.4746 -1.4746 -1.4746 -1.4746 2.16 -7.4639 -7.4639 2.02 -1.5086 -1.5086 -1.5086 2.16 -7.4639 -7.4639 -7.4639 -7.4639 2.02 -1.5086 -1.5086 -1.5086 -1.5086 2.2 -10.331 -10.331 2.025 -1.5454 -1.5454 -1.5454 2.2 -10.331 -10.331 -10.331 -10.331 2.025 -1.5454 -1.5454 -1.5454 -1.5454 2.24 -13.742 -13.742 2.03 -1.5852 -1.5852 -1.5852 2.24 -13.742 -13.742 -13.742 -13.742 2.03 -1.5852 -1.5852 -1.5852 -1.5852 2.28 -16.522 -16.522 2.035 -1.6281 -1.6281 -1.6281 2.28 -16.522 -16.522 -16.522 -16.522 2.035 -1.6281 -1.6281 -1.6281 -1.6281 2.32 -17.621 -17.621 2.04 -1.6743 -1.6743 -1.6743 2.32 -17.621 -17.621 -17.621 -17.621 2.04 -1.6743 -1.6743 -1.6743 -1.6743 2.36 -17.32 -17.32 2.045 -1.7238 -1.7238 -1.7238 2.36 -17.32 -17.32 -17.32 -17.32 2.045 -1.7238 -1.7238 -1.7238 -1.7238 2.4 -14.978 -14.978 2.05 -1.7769 -1.7769 -1.7769 2.4 -14.978 -14.978 -14.978 -14.978 2.05 -1.7769 -1.7769 -1.7769 -1.7769 2.44 -12.527 -12.527 2.055 -1.8337 -1.8337 -1.8337 2.44 -12.527 -12.527 -12.527 -12.527 2.055 -1.8337 -1.8337 -1.8337 -1.8337 2.48 -10.009 -10.009 2.06 -1.8943 -1.8943 -1.8943 2.48 -10.009 -10.009 -10.009 -10.009 2.06 -1.8943 -1.8943 -1.8943 -1.8943 2.52 -7.9086 -7.9086 2.065 -1.9589 -1.9589 -1.9589 2.52 -7.9086 -7.9086 -7.9086 -7.9086 2.065 -1.9589 -1.9589 -1.9589 -1.9589 2.56 -6.6341 -6.6341 2.07 -2.0276 -2.0276 -2.0276 2.56 -6.6341 -6.6341 -6.6341 -6.6341 2.07 -2.0276 -2.0276 -2.0276 -2.0276 2.6 -5.6447 -5.6447 2.075 -2.1005 -2.1005 -2.1005 2.6 -5.6447 -5.6447 -5.6447 -5.6447 2.075 -2.1005 -2.1005 -2.1005 -2.1005
However, in this file, there are duplicate ‘s1’ names, and since duplicate variable names are not permitted, they will be renamed, regardless of the 'VariableNamingRule' setting.
One option I did not think of yesterday that solves this problem —
data = readcell('https://www.mathworks.com/matlabcentral/answers/uploaded_files/619743/S.csv') %Attached below with this Question
data = 1002×17 cell array
{'fm' } {'sm' } {'sm' } {'f' } {'s1' } {'s1' } {'s1' } {'fm' } {'sm' } {'sm' } {'sm' } {'sm' } {'f' } {'s1' } {'s1' } {'s1' } {'s1' } {[ 2]} {[ -3.8175]} {[ -3.8175]} {[ 2]} {[-1.3884]} {[-1.3884]} {[-1.3884]} {[ 2]} {[ -3.8175]} {[ -3.8175]} {[ -3.8175]} {[ -3.8175]} {[ 2]} {[-1.3884]} {[-1.3884]} {[-1.3884]} {[-1.3884]} {[2.0400]} {[ -4.1535]} {[ -4.1535]} {[2.0050]} {[-1.4146]} {[-1.4146]} {[-1.4146]} {[2.0400]} {[ -4.1535]} {[ -4.1535]} {[ -4.1535]} {[ -4.1535]} {[2.0050]} {[-1.4146]} {[-1.4146]} {[-1.4146]} {[-1.4146]} {[2.0800]} {[ -4.6785]} {[ -4.6785]} {[2.0100]} {[-1.4433]} {[-1.4433]} {[-1.4433]} {[2.0800]} {[ -4.6785]} {[ -4.6785]} {[ -4.6785]} {[ -4.6785]} {[2.0100]} {[-1.4433]} {[-1.4433]} {[-1.4433]} {[-1.4433]} {[2.1200]} {[ -5.7046]} {[ -5.7046]} {[2.0150]} {[-1.4746]} {[-1.4746]} {[-1.4746]} {[2.1200]} {[ -5.7046]} {[ -5.7046]} {[ -5.7046]} {[ -5.7046]} {[2.0150]} {[-1.4746]} {[-1.4746]} {[-1.4746]} {[-1.4746]} {[2.1600]} {[ -7.4639]} {[ -7.4639]} {[2.0200]} {[-1.5086]} {[-1.5086]} {[-1.5086]} {[2.1600]} {[ -7.4639]} {[ -7.4639]} {[ -7.4639]} {[ -7.4639]} {[2.0200]} {[-1.5086]} {[-1.5086]} {[-1.5086]} {[-1.5086]} {[2.2000]} {[-10.3309]} {[-10.3309]} {[2.0250]} {[-1.5454]} {[-1.5454]} {[-1.5454]} {[2.2000]} {[-10.3309]} {[-10.3309]} {[-10.3309]} {[-10.3309]} {[2.0250]} {[-1.5454]} {[-1.5454]} {[-1.5454]} {[-1.5454]} {[2.2400]} {[-13.7420]} {[-13.7420]} {[2.0300]} {[-1.5852]} {[-1.5852]} {[-1.5852]} {[2.2400]} {[-13.7420]} {[-13.7420]} {[-13.7420]} {[-13.7420]} {[2.0300]} {[-1.5852]} {[-1.5852]} {[-1.5852]} {[-1.5852]} {[2.2800]} {[-16.5223]} {[-16.5223]} {[2.0350]} {[-1.6281]} {[-1.6281]} {[-1.6281]} {[2.2800]} {[-16.5223]} {[-16.5223]} {[-16.5223]} {[-16.5223]} {[2.0350]} {[-1.6281]} {[-1.6281]} {[-1.6281]} {[-1.6281]} {[2.3200]} {[-17.6208]} {[-17.6208]} {[2.0400]} {[-1.6743]} {[-1.6743]} {[-1.6743]} {[2.3200]} {[-17.6208]} {[-17.6208]} {[-17.6208]} {[-17.6208]} {[2.0400]} {[-1.6743]} {[-1.6743]} {[-1.6743]} {[-1.6743]} {[2.3600]} {[-17.3200]} {[-17.3200]} {[2.0450]} {[-1.7238]} {[-1.7238]} {[-1.7238]} {[2.3600]} {[-17.3200]} {[-17.3200]} {[-17.3200]} {[-17.3200]} {[2.0450]} {[-1.7238]} {[-1.7238]} {[-1.7238]} {[-1.7238]} {[2.4000]} {[-14.9784]} {[-14.9784]} {[2.0500]} {[-1.7769]} {[-1.7769]} {[-1.7769]} {[2.4000]} {[-14.9784]} {[-14.9784]} {[-14.9784]} {[-14.9784]} {[2.0500]} {[-1.7769]} {[-1.7769]} {[-1.7769]} {[-1.7769]} {[2.4400]} {[-12.5270]} {[-12.5270]} {[2.0550]} {[-1.8337]} {[-1.8337]} {[-1.8337]} {[2.4400]} {[-12.5270]} {[-12.5270]} {[-12.5270]} {[-12.5270]} {[2.0550]} {[-1.8337]} {[-1.8337]} {[-1.8337]} {[-1.8337]} {[2.4800]} {[-10.0090]} {[-10.0090]} {[2.0600]} {[-1.8943]} {[-1.8943]} {[-1.8943]} {[2.4800]} {[-10.0090]} {[-10.0090]} {[-10.0090]} {[-10.0090]} {[2.0600]} {[-1.8943]} {[-1.8943]} {[-1.8943]} {[-1.8943]} {[2.5200]} {[ -7.9086]} {[ -7.9086]} {[2.0650]} {[-1.9589]} {[-1.9589]} {[-1.9589]} {[2.5200]} {[ -7.9086]} {[ -7.9086]} {[ -7.9086]} {[ -7.9086]} {[2.0650]} {[-1.9589]} {[-1.9589]} {[-1.9589]} {[-1.9589]} {[2.5600]} {[ -6.6341]} {[ -6.6341]} {[2.0700]} {[-2.0276]} {[-2.0276]} {[-2.0276]} {[2.5600]} {[ -6.6341]} {[ -6.6341]} {[ -6.6341]} {[ -6.6341]} {[2.0700]} {[-2.0276]} {[-2.0276]} {[-2.0276]} {[-2.0276]}
b = cell2table(data(2:end,3:5), 'VariableNames',data(1,3:5))
b = 1001×3 table
sm f s1 _______ _____ _______ -3.8175 2 -1.3884 -4.1535 2.005 -1.4146 -4.6785 2.01 -1.4433 -5.7046 2.015 -1.4746 -7.4639 2.02 -1.5086 -10.331 2.025 -1.5454 -13.742 2.03 -1.5852 -16.522 2.035 -1.6281 -17.621 2.04 -1.6743 -17.32 2.045 -1.7238 -14.978 2.05 -1.7769 -12.527 2.055 -1.8337 -10.009 2.06 -1.8943 -7.9086 2.065 -1.9589 -6.6341 2.07 -2.0276 -5.6447 2.075 -2.1005
It also creates a useful table. The code is very slightly more complicated, however it has the virtue of producing the result you want. I have no idea why the original version of the code failed, only that this one works.
.

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