Remove Certain Values in Matrix

Question

Ben 2022-9-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1809030-remove-certain-values-in-matrix

回答： Chunru 2022-9-21

Hi All,

I have a 8x6 matrix called Vel. Each Column contains one zero value, which is kind of a cutt off. What I want to do is set all the values in the column below the zero value to zero. So I should end up with a matrix that looks like this.

1 3 6 22 25 33

11 12 15 12 15 67

1 32 21 4 25 3

11 12 5 33 15 7

11 32 6 2 25 33

1 0 0 0 12 22

0 0 0 0 0 0

I tried a few things using the index values for the zeroes but I wasn't able to solve the problem and ended up kind of going round in circles. Is there an easy way to achieve this???

Code is below:

Vel = [1,3,6,22,25,33; 11,12,15,12,15,67; 1,32,21,4,25,3; 11,12,5,33,15,7; 11,32,6,2,25,33; 1,0,0,0,12,22; 0,31,6,4,0,0; 12,6,5,5,8,7 ]
Vel = 8×6
     1     3     6    22    25    33
    11    12    15    12    15    67
     1    32    21     4    25     3
    11    12     5    33    15     7
    11    32     6     2    25    33
     1     0     0     0    12    22
     0    31     6     4     0     0
    12     6     5     5     8     7
index = find(Vel==0)
index = 6×1
     7
    14
    22
    30
    39
    47

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Answer 1

Chunru 2022-9-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1809030-remove-certain-values-in-matrix#answer_1057540

在 MATLAB Online 中打开

Vel = [1,3,6,22,25,33; 
    11,12,15,12,15,67; 
    1,32,21,4,25,3; 
    11,12,5,33,15,7; 
    11,32,6,2,25,33; 
    1,0,0,0,12,22; 
    0,31,6,4,0,0; 
    12,6,5,5,8,7 ];
for i=1:width(Vel)
    idx = find(Vel(:,i)==0, 1, 'first');
    Vel(idx:end, i)=0;
end
Vel
Vel = 8×6
     1     3     6    22    25    33
    11    12    15    12    15    67
     1    32    21     4    25     3
    11    12     5    33    15     7
    11    32     6     2    25    33
     1     0     0     0    12    22
     0     0     0     0     0     0
     0     0     0     0     0     0