How to do I set up if loop for the column size?

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yc j 2016-2-1

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关闭： MATLAB Answer Bot 2021-8-20

Some of my data(say set A) is 3x1 column vector and the others(say set B) are 4x1 column vector.

each column will be used to calculate certain equations.

For example,

for set A, I'll do

A(:,1) + 10*A(:,2) + 100*A(:,3)

and for set B, i'll do

0.1*B(:,1) + B(:,2) + 10*B(:,3) + 100*B(:,4)

So I wanna make a 'if loop' to execute all the data files one by one, and let my m-file to recognize what kind of vector it's dealing with so it can use either of the above equation for right situation.

How can I make the loop?

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Answer 1

Walter Roberson 2016-2-1

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https://ww2.mathworks.cn/matlabcentral/answers/266012-how-to-do-i-set-up-if-loop-for-the-column-size#answer_208052

在 MATLAB Online 中打开

size(TheVariable, 1)

or in your situation as you know they are vectors,

length(TheVariable)

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Stephen23 2016-2-1

编辑：Stephen23 2016-2-1

Use size and avoid using length. The length function confuses beginners so much I would suggest that it never be recommended to anyone, rather they should use size and numel. See this for an example of the a beginner very confused by length:

https://www.mathworks.com/matlabcentral/answers/264423#comment_336647

As Guillaume said about length: "That should be purged from every single matlab example and the function deprecated."