How to allow user to retrieve indices for particular value in an array, not the value itself?

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James Best
James Best 2018-11-9
回答： Dennis 2018-11-9
I want to allow a user to index for a value closest to their input value within a table.
I have an Faxis, which I created from performing an FFT, so this does not have rounded values. I would like the user to be able to input a frequency, say 1000Hz and then for the program to locate the nearest frequency in the array.
As the program needs to use the index and not the value itself at a later point, how can I get this, as I can only see people finding the actual value on here?
Faxis = linspace(0,20e3,30e3) %For example only
Frequency_Index = 1000;
Index = find(min(abs(faxis-Frequency_Index))
The closest I have seen is using the find function but even then it seems to just retrieve the value itself, which is of no use here.

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Dennis
Dennis 2018-11-9
In your example you use the find function on only 1 value ( min() returns 1).
You were close, min() can actually return the index on its own.
[~,idx]=min(abs(faxis-Frequency_Index))

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