Forcing matrices to match in size

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g
g il 7 Set 2019
Risposto: Walter Roberson il 8 Set 2019
Let's say I have two single-row matrices A and B.
I want to check if A and B have the same number of columns. If they do, do nothing.
If not, I want to remove the last character in B.
For example, if we have
A = [30 25 78]
B = [17 91 44 83]
Then I want to remove the last column of B, leaving
A = [30 25 78]
B = [17 91 44]
But if we originally had
A = [30 25 78]
B = [17 91 44]
then do nothing. What scheme could accomplish this?

Risposte (2)

Arturo Mendoza Quispe
Arturo Mendoza Quispe il 8 Set 2019
B = B(1:numel(A));
This will set B to have the size of A, hence there is no need for an if statement.
  3 Commenti
g
g il 8 Set 2019
Modificato: g il 8 Set 2019
Based on what I'm working with, the number of columns in B is always greater than or equal to the number of columns in A. I should have been more precise.
Walter Roberson
Walter Roberson il 8 Set 2019
But you still only want to remove one column of B in that case, right? Because your problem title talks about making them match. Arturo's solution is great to make them match, but is not the correct solution if exactly one column is to be removed from B.

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Walter Roberson
Walter Roberson il 8 Set 2019
B = B(1:end-(length(A) ~= length(B)));
Leaves B the same length if A and B are the same length, and otherwise removes exactly 1 element from B.

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