Method of subtracting a number from a three-dimensional matrix

Welcome all and thanks in advance for help.

I have a 3D matrix size (300 x 16 x 21), I want to find a loop to subtract the number 1000 from the first column that has 300 rows

Answer 1

[KSSV]

Instead of loop, you can do the following: LEt A be your matrix of size 300x16x21.

A(:,1,:) = A(:,1,:)-1000 ; 

[nada]

thank you KSSV

I mean, it works like this example

A( 300x16x21) - 1000= (1-1000 , : , : )

(2-1000, : , : )

*

*

*

(300-1000, : , : )

A(new) = A(300 , 16 ,21 )

[KSSV]

Anew = A(:,1,:)-1000 ;