Hello everyone, I want to restrict the domain of a vector to return it to a smaller data set. For example, X between 2 and 7

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Juan David Parra Quintero
回答： dpb 2022-8-10
X = [ 1 2 3 4 5 6 7 8 9 10 ];

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dpb
dpb 2022-8-10
Perfect use for my utility function iswithin
>> x=1:10;
>> x=x(iswithin(x,2,7))
x =
2 3 4 5 6 7
>>
where iswithin is
function flg=iswithin(x,lo,hi)
% returns T for values within range of input
% SYNTAX:
% [log] = iswithin(x,lo,hi)
% returns T for x between lo and hi values, inclusive
flg= (x>=lo) & (x<=hi);
end
It's just "syntactic sugar" remove the logical expression out of the main code for legibility, but it's extremely handy for shortening multiple range selections or the like or using it in arguments to other functions instead of building temporaries.
Copy to an m-file named "iswithin.m" and place wherever on your MATLABPATH you keep such handy little goodies where they're available for everybody. I create a "Utilities" subdirectory and insert in second in line in my MATLABPATH behind my current working directory.

更多回答（2 个）

Image Analyst
Image Analyst 2022-8-10
Ran in:
Try this:
X = [ 1 2 3 4 5 6 7 8 9 10];
mask = X > 2 & X < 7; % Or X >=2 & X <= 7
X = X(mask)
X = 1×4
3 4 5 6
the cyclist
the cyclist 2022-8-10
Ran in:
X = [ 1 2 3 4 5 6 7 8 9 10 ];
idxToKeep = (X>=2) & (X<=7);
Xkeep = X(idxToKeep)
Xkeep = 1×6
2 3 4 5 6 7
You can also do it all in one line, without the intermediate variable
Xkeep = X((X>=2)&(X<=7))
Xkeep = 1×6
2 3 4 5 6 7
or not define a new variable, if you don't need one
X = X((X>=2)&(X<=7))
X = 1×6
2 3 4 5 6 7

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