Variable pre-definition

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tomas 2011-8-24

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回答： bharat suthar 2020-5-23

Hello,

how can I pre-define list of variables (e.g. var_1,var_2,...,var_n) that have the same content, for example zeros(100). I thought [var_1,var_2,...var_n]=[zeros(100),zeros(100),...,zeros(100)]; could work, but I was wrong. Any idea is appreciated.

Thank you very much,

Tom

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Answer 1

Amanda Galtman 2011-8-24

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Try using the deal function:

[var_1, var_2, var_3] = deal(zeros(100));

HTH, Amanda

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tomas 2011-8-24

That's it. Thank you Amanda :-)

Jan 2011-8-24

This is correct, but not optimal for pre-allocation: After DEAL, the variables use shared data copies, which point to teh same memory. If you write to these variables, the sharing link must be released at first. Therefore a direct "var_1=zeros(100); var_2=zeros(100)" is slightly faster. But if it concerns 3 or 50 variables only, this delay can be neglected.

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