Replacing elements in matrix with relational operations
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I am given a problem where I am given a matrix and I am suppose to change the values of the matrix depending on if a certain element of the matrix is greater than or less than a number. If it is greater than the variable n1 I am suppose to change the element to c1 and if is less than n1 I am suppose to change it to c2. I am to use only relational operations, I cannot use for, if, while or any implicit functions. How can I do this? This is what I have so far m3 is the matrix I am given
m4 = ((m3>n1)*c1)
m5 = ((m3<=n1)*c2)
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David Sanchez
2013-10-7
M=randi(10,3);
n1 = 5;
c1 = 4;
c2 = 3;
M1 = M<5;
D1 = c1*M1;
M2 = M>=5;
D2 = c2*M2;
new_M = D1 + D2;
% In a single line
new_M = c1*(M<5) + c2*(M>=5);
Adapt the values of n1, c1 and c4 to yours needs.
2 个评论
David Sanchez
2013-10-7
I meant to use n1 instead of its value:
% In a single line
new_M = c1*(M<n1) + c2*(M>=n1);
Walter Roberson
2013-10-7
Addition is an implicit function in MATLAB: the method @double/plus will be called in this situation. Multiplication is also a function; I think @double/mtimes would be called for your code suggestion. Note that .* would be better than * in your code
Your code suggestion does not leave unchanged the parts of M that do not satisfy the conditions.
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Walter Roberson
2013-10-7
0 个投票
The task cannot be accomplished without using at least one implicit function other than the relational operators.
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