A compact way to assign values of a matrix to another matrix

Question

Sim 2023-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/1982244-a-compact-way-to-assign-values-of-a-matrix-to-another-matrix

编辑： Dyuman Joshi 2023-6-13

How to assign the values of matrix "x" to the matrix "y" in a, possibly, single line of code?

% Input
x = [3 2 2; 4 5 3; 6 5 4; 4 6 5; 5 6 6; 6 6 7];
y = logical([0 0 0; 1 1 1; 1 1 1; 1 1 1; 1 1 1; 1 1 1; 1 1 1]);
% Desired Output
>> y
Invalid use of operator.
y =
     0     0     0
     3     2     2
     4     5     3
     6     5     4
     4     6     5
     5     6     6
     6     6     7
     
% My attempt
>> y(find(y))=x
y =
  7×3 logical array
   0   0   0
   1   1   1
   1   1   1
   1   1   1
   1   1   1
   1   1   1
   1   1   1

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Stephen23 2023-6-13

"How to assign the values of matrix "x" to the matrix "y" in a, possibly, single line of code?"

Given that matrix y is of logical type, all non-zero values will be cast into TRUE values. Is that what you want?

Sim 2023-6-13

在 MATLAB Online 中打开

@Stephen23, thanks for the comment!! No, I do not want that all non-zero values will be cast into true values. I would like this (I just converted the logical matrix into a numerical matrix):

x = [3 2 2; 4 5 3; 6 5 4; 4 6 5; 5 6 6; 6 6 7];
y = ([0 0 0; 1 1 1; 1 1 1; 1 1 1; 1 1 1; 1 1 1; 1 1 1]);
y(y~=0)=x
y = 7×3
     0     0     0
     3     2     2
     4     5     3
     6     5     4
     4     6     5
     5     6     6
     6     6     7

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Answer 1

Dyuman Joshi 2023-6-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1982244-a-compact-way-to-assign-values-of-a-matrix-to-another-matrix#answer_1254734

编辑：Dyuman Joshi 2023-6-13

在 MATLAB Online 中打开

Since y is a logical array, any values assigned to it will be converted to corresponding logical value.

Convert y into double and then assign -

%Modified x, x(1,2) is 0.
x = [3 0 2; 4 5 3; 6 5 4; 4 6 5; 5 6 6; 6 6 7];
y = logical([0 0 0; 1 1 1; 1 1 1; 1 1 1; 1 1 1; 1 1 1; 1 1 1]);
%temporary variable
y1 = y;
%assigning to logical
%You can see how assignment is done to logical array
%0 is assigned as 0 and any other value is 1
y1(y1) = x
y1 = 7×3 logical array
   0   0   0
   1   0   1
   1   1   1
   1   1   1
   1   1   1
   1   1   1
   1   1   1
%convert to double 
z = double(y)
z = 7×3
     0     0     0
     1     1     1
     1     1     1
     1     1     1
     1     1     1
     1     1     1
     1     1     1
%and assign
z(y)=x
z = 7×3
     0     0     0
     3     0     2
     4     5     3
     6     5     4
     4     6     5
     5     6     6
     6     6     7

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Sim 2023-6-13

thanks a lot @Dyuman Joshi!! Very clear :-)

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Answer 2

Sim 2023-6-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1982244-a-compact-way-to-assign-values-of-a-matrix-to-another-matrix#answer_1254724

编辑：Sim 2023-6-13

在 MATLAB Online 中打开

Sorry, stupid question... I had a logical matrix "y" and I got what I wanted, just by assigning a numerical array instead of a logical one:

x = [3 2 2; 4 5 3; 6 5 4; 4 6 5; 5 6 6; 6 6 7];
y = ([0 0 0; 1 1 1; 1 1 1; 1 1 1; 1 1 1; 1 1 1; 1 1 1]);
y(y~=0)=x
y = 7×3
     0     0     0
     3     2     2
     4     5     3
     6     5     4
     4     6     5
     5     6     6
     6     6     7