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

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.

Answer 1

[Dennis]

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))