Error using 'Save' including quotation marks around variables

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Nora Laine Herzog
Nora Laine Herzog 2020-7-28
回答： Steven Lord 2020-7-29
I am running a piece of code that generates and plots two variables (Dmed and DSEM). The code has been used by my workplace for a long time, and it works well. I did not write it.
I want the raw numbers from the plot to save into a .csv file so I can run a separate analysis later looking at the individual numbers generated.
This is a loop that runs through selected data.
Every time I try to run it, it returns the same error:
Error using save
Must be a string scalar or character vector.
save([filename, '_output', '.csv'], 'Dmed', 'DSEM')
% I have also tried this without 'Dmed' and 'DSEM', where the variables are run like this:
save([filename, '_output'], Dmed, DSEM)

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回答（2 个）

madhan ravi
madhan ravi 2020-7-28
Use writematrix() or dlmwrite() or csvwrite() for older versions bearing in mind that
filename = 'sample'; % for example
  1 个评论
Nora Laine Herzog
Nora Laine Herzog 2020-7-29
It is not an old version. I am using MATLAB_R2020a. Filename was defined earlier in the code, and I don't have difficulties, except when I am trying to save the variables. If I am running the full code, which plots the variables that I want to save, I get no errors. That is why I am confused.

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Steven Lord
Steven Lord 2020-7-29
My guess is filename is a cell array containing a char row vector.
x = 1:10;
thefile = 'data571924.mat';
save(thefile, 'x') % works
thefile2 = {'data571924_cell.mat'};
save(thefile2, 'x') % fails
save(char(thefile2), 'x') % works
Many functions that can accept a char vector can also accept a cell array containing a char vector. save is not one of those many functions.

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