Equality of a numeric list using a string
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I have a set of values fwhm that I then remove valyes lower than Y20. However, I use this in many places and sometimes want values > Y20
T=fwhm(fwhm>Y20);
Is there a way to pass the string for the equality, where in the case above I could pass either '>Y20' or '<Y20'?
Thanks
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Accepted Answer
Walter Roberson
on 28 Jan 2016
If Y20 is known at the time you decide whether you want > or <, then define a function:
selY20 = @(Var) Var(Var>Y20);
or
selY20 = @(Var) Var(Var<Y20);
depending on which one you want. Then your code would have
T = selY20(fwhm);
If you do not know Y20 at the time you make the decision, then at the time of the decision define a function
selY = @(Var, Y) Var(Var<Y);
or
selY = @(Var, Y) Var(Var>Y);
and code
T = selY(fwhm, Y20);
Or if you want to be more hard-core,
selY = @lt;
or
selY = @gt;
and code
T = fwhm(selY(fwhm, Y20));
A < B is the same internally as lt(A,B) and A > B is the same internally as gt(A,B)
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More Answers (2)
Guillaume
on 28 Jan 2016
Edited: Guillaume
on 28 Jan 2016
I'd recommend you use function handles rather than strings:
comparisons = {@gt, @lt}; %gt is the function name of >, lt is the function name of <
selectedcomparison = 1; %1 is <, 2 is >
T = fwhm(comparisons{selectedcomparison}(fwhm, Y20)) %note that the brackets after {...} is a function call
edit: if you really want to use strings:
comparisons = {'<', '>'};
selectedcomparison = 1; %1 is <, 2 is >
compfn = str2func((comparisons{selectedcomparison});
T = fwhm(compfn(fwhm, Y20))
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