How to skip zero columns with MatLab?

Hello,

I have a 2048x65 data matrix called data1 which includes some colums with only zero values. I want my code to skip those zero colums.

I already tried with

dat1 = nonzeros(data1);
data_1 = reshape(dat1,2048,65);

but it seems, that the values are resorted in a wrong order.

So I tried this:

line = 823;
column = 4;
line_new = 1;
spalte_new = 1;
data_1 = 1;
for dat1 = data1(line, colums)
    if dat1 ~= 0
        data_1(line_new, spalte_new) = dat1(line, column)
        column = column + 1
        column_new = column_new +1
    else
        column = column +1
    end
end

I also tried with the continue statement, but failed as well.

Could someone help me please? ~Johanna

Answer 1

[Walter Roberson]

col_has_nonzero = any(data1 ~= 0,1);
data1_no_zerocol = data1(:, col_has_nonzero);

Answer 2

[KSSV]

Check the demo example:

A = rand(10) ; 
% Replace few columns with zero dor demo 
[m,n] = size(A) ; 
A(:,3) = 0 ;
A(:,9) = 0 ; 
% Remove zero columns
idx = sum(A==0,1)  ;
A(:,idx~=0 ) = []