how do i change a variable name from workspace

Question

Tossawon Ngamnet 2018-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/411879-how-do-i-change-a-variable-name-from-workspace

编辑： Tossawon Ngamnet 2018-7-25

i have a sequence of .mat files. When i load the mat files into workspace, the variable names are composed of sing or double underscore such as 'IR0004__, IR 10001_'. Thus, i would like to change these variables to be only number. How can i delete the underscore?

Please suggest Thank you

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Stephen23 2018-7-25

编辑：Stephen23 2018-7-25

在 MATLAB Online 中打开

As I wrote in my comment, to load the data into one non-scalar array all variables in the .mat files must have exactly the same variables. This appears to not be the case with your .mat files, so you cannot use this method. If the variable names were exactly the same (as they should be) then you can simply do this:

for k = 1:N
    S(k) = load(...)
end

As noted, this only works if the variable names are the same! Instead, you could use a cell array:

C = cell(1,N);
for k = 1:N
    S = load(...);
    C(1) = struct2cell(S);
end

Note that rather than this

['IR',num2str(fidx,'%04d'), '.mat']

you should use sprintf:

sprintf('IR%04d.mat',fidx)

Tossawon Ngamnet 2018-7-25

编辑：Tossawon Ngamnet 2018-7-25

Dear cobeldick, I used this code from your suggestion

files = dir('*.mat'); cell(1,numel(files)); for fidx = 1:numel(files) S = load(sprintf('IRFrame%04d.mat',fidx)); C(1) = struct2cell(S); end

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Answer 1

KALYAN ACHARJYA 2018-7-24

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在 MATLAB Online 中打开

new_var_name=old_var_name;
clear('old_var_name');

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KALYAN ACHARJYA 2018-7-24

编辑：KALYAN ACHARJYA 2018-7-24

Please check the answer in this link , it will get the idea.

Stephen23 2018-7-24

编辑：Stephen23 2018-7-24

"For example, using a complete code to rename all the files in my workspace"

Note that files are not in any MATLAB workspace, files are saved on your harddrive. Variables are in MATLAB workspace. Basic concepts, such as what variables are, are explained in the introductory tutorials:

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

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Answer 2

Giridharan Kumaravelu 2018-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/411879-how-do-i-change-a-variable-name-from-workspace#answer_330108

编辑：Giridharan Kumaravelu 2018-7-24

在 MATLAB Online 中打开

getname = @(x) inputname(1);
IR0004__ = 10;
str = getname(IR0004__);
newstr = erase(str,'_');
eval([newstr '=' str ';']);
clear(str);

This could help you rename one variable. But if you are looking to rename the variables containing only numbers in the name, that will not be valid variable name in any programming language.

Hope this helps!

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Tossawon Ngamnet 2018-7-24

编辑：Stephen23 2018-7-24

在 MATLAB Online 中打开

This code below was composing both uploading and converting mat to tif by using command line:

output_folder = 'D:\iSkysoft iMedia Converter Deluxe\Downloaded';
files = dir('*.MAT'); 
for fidx = 1:numel(files ) 
matcontent = load(files(fidx).name); 
filenumber = regexp(files(fidx).name, '\d+', 'match', 'once'); 
imagename = sprintf('IR%s__', filenumber); 
assert(isfield(matcontent, imagename), 'mat file %s does not contain image %s', files(fidx).name, imagename ); 
outputfilename = fullfile(output_folder, sprintf('test%s.tif', filenumber )); 
imwrite(matcontent.(imagename), outputfilename ); 
end

It may help you to understand my problem because i cannot sent you a figure. the double underscore will be created when the mat files less than 10000 ( IRFrame0001__), but after 10000 the single underscore will be created (IRFrame10000_). For example, IR10007_,IR10006_,IR10007_,IR10008_,IR10009_,IR1000__,IR10010_,.. Sorting is not consecutive. Thus, i cannot use for loop to initial the variable names correctly.