Problem with indexing a series of ranges

Hello,

I know my level is very basic, but I read a lot and I couldn't find the solution I need.

I am using a function to calculate the max value of an array in segments of 75 values (max value of the segment from 1 to 75, max value of the segment from 76 to 150...and so on).

I am using

Max = max(reshape(data, 75, []))

it is working very well.

But as now I need to have also the indexing of it I tried with

[Max, iMax] = max(reshape(data, 75, []))

but it gives me the indexing of the values inside their segment (always a number from 1 to 75) while I would need the originary indexing.

Any idea?

Thank you!

Silvia

Answer 1

[Stephen23]

Use MAX's "linear" option:

M = randi(9,5,7)

M = 5×7

9 4 4 3 3 5 8 2 6 1 3 9 1 2 4 5 3 8 8 1 4 5 1 3 3 4 5 3 9 6 4 2 4 7 1

[V,X] = max(M, [], 'linear')

V = 1×7

9 6 4 8 9 7 8

X = 1×7

1 7 11 18 22 30 31

To be robust you should also specify the dimension:

[V,X] = max(M, [], 1, 'linear');

Just for comparison, without the "linear" option for each column the relevant row index is returned:

[~,Y] = max(M)

Y = 1×7

1 2 1 3 2 5 1

[Silvia Marchesi]

Thank you! It works perfectly!

[Stephen23]

@Silvia Marchesi: my pleasure! Please remember to accept my answer if it helped you!

[Silvia Marchesi]

Of course, thank you again!