Split vector by value ranges?

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Don Kelly
Don Kelly on 26 Jan 2021
Edited: Don Kelly on 28 Jan 2021
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)
  2 Comments
Don Kelly
Don Kelly on 28 Jan 2021
Edited: Don Kelly on 28 Jan 2021

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Accepted Answer

weikang zhao
weikang zhao on 26 Jan 2021
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!
  3 Comments
weikang zhao
weikang zhao on 26 Jan 2021
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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More Answers (1)

Walter Roberson
Walter Roberson on 26 Jan 2021
[r,s,t] = deal(w(w>0 & w<10),w(w>10 & w<100),w(w>100 & w<1000))
  1 Comment
Don Kelly
Don Kelly on 28 Jan 2021
Thank you Walter,
I accepted weikang zhao's answer since it was functional and first. I wanted to say that I am really grateful for your answer as well.

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