Split vector by value ranges?

Question

Don Kelly 2021-1-26

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/727028-split-vector-by-value-ranges

编辑： Don Kelly 2021-1-28

采纳的回答： weikang zhao

在 MATLAB Online 中打开

Given:

w=[2,8,3,30,4,50,100,200,4,80,500]

How can I turn the following into a single line of code?

r=w(w>0 & w<10)
s=w(w>10 & w<100)
t=w(w>100 & w<1000)

I tried variations of:

[r,s,t]=w(w>0 & w<10),w(w>10 & w<100),w(w>100 & w<1000)

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Stephen23 2021-1-26

编辑：Stephen23 2021-1-26

@Don Kelly: I removed all of those ```and ´´´ characters, and formatted your code correctly by simply selecting the text and clicking the CODE button.

Don Kelly 2021-1-28

编辑：Don Kelly 2021-1-28

Thank you @Stephen Cobeldick

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Answer 1

weikang zhao 2021-1-26

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/727028-split-vector-by-value-ranges#answer_606403

在 MATLAB Online 中打开

Use anonymous functions, it allows you to implement quite complex functions in one line. MATLAB supports dot indexing into function call results, as in foo(arg).prop. Other forms of indexing into function call results (with parentheses such as foo(arg)(2) or with curly braces such as foo(arg){2}) are not supported. So, I used feval and anonymous functions to complete this function in disguise.

w=[2,8,3,30,4,50,100,200,4,80,500];
[r,s,t]=feval(@(x) x{:},arrayfun(@(a,b) w(w>a&w<b),[0,10,100],[10,100,1000],'UniformOutput',false));

have fun!

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Don Kelly 2021-1-26

I guess also is there a less advanced way?

weikang zhao 2021-1-26

在 MATLAB Online 中打开

An anonymous function does not need to name the function handle, you can destroy it in place after using it like I did. You can view the output of arrayfun&`feval`, this will help you understand. `arrayfun` can apply function to each element of array, so

arrayfun(@(a,b) w(w>a&w<b),[0,10,100],[10,100,1000],'UniformOutput',false)

will get a cell array and three matrices are stored separately.

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