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Trouble allocating values to matrix

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B T
B T 2012-2-29
关闭： MATLAB Answer Bot 2021-8-20
Hello.
I am trying to assign values to a matrix, but am having some trouble doing so.
clc;
clear all;
X=ones(22,22);
X1=3.2;
X2=1.5;
T1=X(1:3,1:3);
T2=X(10:13,9:11);
T3=X(20:22,20:21);
if T1
X*X1
else if T2
X.*X1
else if T3
X.*X1
else
X.*X2
end
end
end
end
When I do this, every value in the matrix becomes 3.2 (X1). I am not using the else statement correctly I believe.
The goal is to have the X1 values at the locations specified by T1,T2 and T3 and have everything else equal to X2.
All help greatly appreciated.
bt

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回答（2 个）

Walter Roberson
Walter Roberson 2012-2-29
if T1
is equivalent to
if all(T1(:))
That is, the condition is true only if every value in the matrix is non-zero.
the cyclist
the cyclist 2012-2-29
In addition to Walter's answer, note that in your if ... else statements, you never actually assign values to any variables. You only display X.*X1, etc.

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