How to multiply a matrix by 0?

Hello,

I have this file in .txt and i want to make a matrix and multiply it by 0 using matlab!

Can somebody help me? I've been looking at other videos and answers but can't work it out. Thanks!

Answer 1

[Sulaymon Eshkabilov]

Why to muply the matrix by zero when the resul;t will be a matrix of the same size with zeros. If you need to create a matriz of the same size as your data, then this is the way:

clearvars
unzip('HSF_PVerde_Lvl1.zip');
D = readmatrix('HSF_PVerde_Lvl1.txt');
D0 = zeros(size(D));                    % This is the way
D0A = D*0;
whos 

  Name           Size               Bytes  Class     Attributes

  D         160128x12            15372288  double              
  D0        160128x12            15372288  double              
  D0A       160128x12            15372288  double              

D0

D0 = 160128×12

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

D0A

D0A = 160128×12

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

[Steven Lord]

Why to muply the matrix by zero when the resul;t will be a matrix of the same size with zeros.

Most of the time that's correct. If nonfinite values are involved it's not.

A = [1 2 0; NaN Inf -Inf]

A = 2×3

1 2 0 NaN Inf -Inf

B = 0*A

B = 2×3

0 0 0 NaN NaN NaN