saving variables programmatically using list of variable names

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checker
checker 2020 年 6 月 5 日
コメント済み: checker 2020 年 6 月 5 日
Hi all,
This should be simple but I think my frustration level is keeping me from seeing the path.
I simply want to save some variables on the workspace based on a list of those variable names.
a=1;b=2;c=3
varNames = {'a','b','c'};
save('myMatFile',varNames)
which yields the error 'Error using save. Must be a string scalar or character vector'. (what must be a string scalar? File name? vars? Yes I know, vars, but still TMW...)
so how about
save('myMatFile',cell2mat({'a,','b,','c'});
yielding the more useful error 'a,b,c' is not a valid variable name.
I see where this is going, I must have a properly formatted string array akin to eval inputs. But there really should be an easier way, like my original attempt.
Thanks for the support and letting me rant a bit.
-Chris
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Steven Lord
Steven Lord 2020 年 6 月 5 日
That message does seem vague. I've reported that to the development staff.

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採用された回答

Stephen23
Stephen23 2020 年 6 月 5 日
編集済み: Stephen23 2020 年 6 月 5 日
The simple solution is to use a comma-separated list:
varNames = {'a','b','c'};
save('myMatFile',varNames{:})
% ^^^ you need this!
Tip: when load-ing the file data you should use an output variable (which is a scalar structure):
S = load(...);
  1 件のコメント
checker
checker 2020 年 6 月 5 日
OK, I've accepted this as a correct answer since it does the job nicely and simply, thanks. intuitively or more importantly per the help for 'save'? Not so much. How is varNames{:} equivalent to a 'string scalar or character vector'?

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その他の回答 (1 件)

Sulaymon Eshkabilov
Sulaymon Eshkabilov 2020 年 6 月 5 日
編集済み: Sulaymon Eshkabilov 2020 年 6 月 5 日
Here is an easy solution:
a=1;b=2;c=3;
save('myMatFile.mat','a','b','c')
% Or
a=1;b=2;c=3;
MY_var = {'a','b','c'};
save('myMatFile.mat','MY_var')
  1 件のコメント
Stephen23
Stephen23 2020 年 6 月 5 日
編集済み: Stephen23 2020 年 6 月 5 日
This code
MY_var = {'a','b','c'};
save('myMatFile.mat','MY_var')
will just save a cell array of character vectors 'a', 'b', and 'c', not the variables with the corresponding names. This does not resolve the original question.

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