How to write Continue Long Statements on Multiple Lines ?

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Vuqar Samedov 2019-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/494027-how-to-write-continue-long-statements-on-multiple-lines

评论： dpb 2019-11-30

formatSpec = '%f%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%f%f%q%q%q%f%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%f%q%q%f%q%q%f%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%C%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%q%f%q%q%q%q%q%q%q%q%q%q%f%q%q%q%q%q%q%q%q%q%q%q%q%q%q%[^\n\r]';

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Answer 1

Steven Lord 2019-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/494027-how-to-write-continue-long-statements-on-multiple-lines#answer_404015

编辑：Steven Lord 2019-11-30

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Another way to do this, with a sufficiently recent release of MATLAB, is to join elements of a string array together with the repeated elements of the format being duplicated with repelem. The second input to join says to concatenate the string array elements with nothing between them.

join(["%f", repelem(["%q", "%f", "%q", "%f"], [45 2 3 2]), "%[^\n\r]"], "")

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dpb 2019-11-30

Ah! Nice refinement, Steven...hadn't thought of it.

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Answer 2

dpb 2019-11-30

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The ugliness of the C-style formatting string in all its glory exhibited!!! Why TMW didn't go to the trouble to keep Fortran FORMAT instead. :(

Anyways, don't do this...do something like

fmt=['%f' repmat('%q',1,45) repmat('%f',1,2) repmat('%q',1,3) repmat('%f',1,2) ...
     ... 
    '%[^\n\r]'];

where continue to build the counted substrings as needed in place of "..." placeholders above.

The answer to the actual Q? asked is the line continuation syntax in Matlab is "...". For string continuation, must terminate the pieces on each line and let the input parser string them together; the above syntax encloses the actual strings excepting the first and last unique entries as the argument to the repmat function.

PS. Thanks to SL, TMW for illustrating this idiom years ago... :)