Dynamically allocated variables with indices..

Question

Robert 2015-6-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/224295-dynamically-allocated-variables-with-indices

回答： Walter Roberson 2015-6-18

Hello folks,

Quick question. I need to dynamically allocate variables from a cell array using a string value within the cell.. I know it is not good practice to use eval but my application requires me to do this. The expression I require to be evaluated is:

eval(sprintf('%s = ''%s''',cell2mat(stocks(i,1)),cell2mat(C(1,k))))  
- which has the output: AAVL = 300

However I need the output: AAVL(j,k) = 300

I am having trouble adding indices..

When I try this:

eval(sprintf('%s(%d,%d) = ''%s''',cell2mat(stocks(i,1)),j,k,cell2mat(C(1,k))))

which gives an error: Assignment has more non-singleton rhs dimensions than non-singleton subscripts

note:

    cell2mat(stocks(i,1)) % yields the AAVL string
    cell2mat(C(1,k))) % yields the value 300 which was initially a string

Any help would be much appreciated!

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Answer 1

Walter Roberson 2015-6-18

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/224295-dynamically-allocated-variables-with-indices#answer_183087

在 MATLAB Online 中打开

allvars.(stocks{i,1})(j,k) = str2double(C{1,k}));

That is, do not use eval, do not generate variable names on the fly. Use dynamic field names on a structure. Eventually you may need to save the structure as individual variables; you can do that with

save('AppropriateFilename.mat', 'allvars', '-struct')

which will create one variable in the .mat file for each field of structure allvars.