MATLAB: Finding the index of a height.

findindexlogical indexing

New to Matlab and trying to find the index of a height y when it first becomes negative on my plot.

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Steven, use something like

 x   = 1:0.1:5;
 y   = sin(x);  % this would be your height
 ind = find(x==min(x(y<0)))

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MATLAB: Vectorizing finding indexes

[counts, tIND] = histc( X, Y );
IND = tIND + 1;  %to get the higher index

Note that this has questionable results in the case where an X is exactly equal to a Y: it will return the bin number of the next Y. You could, though, correct for this with

t = (X == Y(tIND));
IND(t) = IND(t) - 1;

It is also possible to correct for it at the time of histc(), but the code becomes notably more difficult to read.

MATLAB: Indexing

I0=find(x==0)
I30=find(x==-30)

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Related Solutions

MATLAB: Vectorizing finding indexes

MATLAB: Indexing

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