Matrix manipulation using strcmp

Question

Zach 2012-3-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/34006-matrix-manipulation-using-strcmp

Forgive me if this is a simple question that I should be able to answer myself, but I've been struggling with the proper use of this for a few days now. I'm a relatively novice MatLab user.

I have a 2xn matrix. The left column is made up of strings, the right values associated with those strings, like this

OL 4

WR 7

OL 3

AT 2

What I've been trying to do is use strcmp to pick a particular sring and then return its associated value in a new 2xm matrix consisting solely of the string (for example 'OL' and the values associated with each.

This seems like a simple problem, however, I'm stuck.

Thanks in advance for any help you can give me.

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Answer 1

Thomas 2012-3-30

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https://ww2.mathworks.cn/matlabcentral/answers/34006-matrix-manipulation-using-strcmp#answer_42673

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a = {'OL',4;'WR',7;'OL',3;'AT',2}
c=arrayfun(@(x) strcmp(x,'OL'),{a{:,1}});
d=a(c,2)

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Zach 2012-3-30

This works perfectly, thanks.

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Answer 2

Honglei Chen 2012-3-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/34006-matrix-manipulation-using-strcmp#answer_42670

在 MATLAB Online 中打开

a = {'OL',4;'WR',7;'OL',3;'AT',2}
b = a(cellfun(@(x) strcmp(x,'OL'),{a{:,1}}),:)

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Zach 2012-3-30

This answer seems correct. However, I'm getting an error that 'g' is undefined. I tried to define it as g = [], but that doesn't work and obviously I'm not understanding what the variable, g, is.

Any expansion on this would be appreciated.

Thanks again for your help.