"Error using save Must be a string scalar or character vector." - but it is a string!

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EQ
EQ 2019-4-7
评论： Walter Roberson 2021-8-4
I'm getting the error when I run the following line:
save(['data/test',num2str(n),'.mat'],U,U_old,dt);
where n is my loop index. This is bizarre. For the record, when I stop at the breakpoint, typing this at the command line works:
save data/test1.mat U U_old dt
But I need to be able to change the filename within the loop, hence why I'm doing it the first way. When I type this at the command line:
['data/test',num2str(n),'.mat']
I get the expected 'data/test1.mat' result. The variable U is an 889x4 matrix, U_old is the same size, and dt is a single float. Even typing
save('data/test1.mat',U,U_old,dt);
at the command line when I stop gives me this error. What gives?

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采纳的回答

A. Sawas
A. Sawas 2019-4-7
编辑：A. Sawas 2019-4-7
You need to enclose the variable names with qoutations like this:
save(['data/test',num2str(n),'.mat'],'U','U_old','dt');
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Walter Roberson
Walter Roberson 2019-4-7
save( sprintf('data/test%d.mat', n), 'U', 'U_old', 'dt');
The quotes around the U and so on are the important part for your problem; the sprintf is just a cleaner way of creating the file name.

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