A simple allocation of array places to zero does not work in MATLAB R2020B

I have a numeric array KSE

I have identified a number of locations where there are peaks,

locations =

Columns 1 through 10

147 827 3772 4762 5192 5618 6048 6481 6915 7350

Columns 11 through 20

7781 8206 8637 9070 9502 9938 10367 10793 11225 11657

Columns 21 through 26

12922 13876 20315 23377 24431 25492

I have identified in that array a number of locations where there are short lived transients, a number of which I wish to remove.

Those unwanted transients are identified by

ii =

1 2 3 21 22 23 24 25 26

The command

KSE(locations(ii)-50:locations(ii)+50)=0

is meant to replace 50 array elements on either side of the transient location with a zero.

It works well at the first location but not in the remaining 8 locations!

Is this a bug or am I doing some sort of stupid coding mistake?

Any soultions would be appreciated!

[SACHIN KHANDELWAL]

Could you please explain a bit more ? Would be helpful

[Branko Celler]

I am not sure that I can be more explicit!

KSE is an an array of numbers. In that array are a number of transients I wish to remove.

I know the location of the transients (locations)

I know the subset of the locations of the transients I wish to remove (array ii)

I want to replace each unwanted transient with 50 samples on either side of the location set to zero using the command

KSE(locations(ii)-50:locations(ii)+50)=0;

only the first location in ii is processed!

[Branko Celler]

I am not sure I can be more explicit. I have a data array KSE.

In that array I have identified a number of peaks located in 'locations'

A number of those peaks are spurious transients I wish to remove the transient locations are identified in array 'ii'

I want to remove those transients by replacing the values of KSE 50 samples on either side of the centre location with zeros, using the command

KSE(locations(ii)-50:locations(ii)+50)=0;

Only the first instance of ii works as expected.

Answer 1

[Voss]

One solution is to construct a matrix of indices:

KSE(locations(ii)+(-50:50).') = 0;