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How to use values of certain matrices without using for loop?

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Beibit Sautbek
Beibit Sautbek 2016-8-2
评论： Star Strider 2016-8-2
I have certain values a, b and c. I have P=a*b/c;
For example, If a=2, b=6, c=4. Then P will be P=2*6/4=3;
But, If I want to check three cases, when values of a, b and c will change, how P will be changed?
First case:: If I want to check effect of 'a',
If a=(1:1:10); b=6, c=4. So, in this case P will be matrix .
Second case:: If I want to check effect of 'c',
If a=2; b=6, c=(100:100:1000). So, in this case P will be matrix .
How Can I do this, without using for loop and 'if'?
Could anyone help me?
P.S. I have large code, and a lot of values as a, b and c. Therefore will be very complicated to use for loop and if.

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Star Strider
Star Strider 2016-8-2
You need to vectorize the expression. The easiest way to do what you want is to turn ‘P’ into an anonymous function and if all your values are between 1 and 10, use a meshgrid call:
P = @(a,b,c) a.*b./c;
[M1,M2,M3] = meshgrid(1:10);
Pm = P(M1,M2,M3);
This runs. I do not know what you want, so I will leave you to sort out the ‘Pm’ matrix.
  2 个评论
Star Strider
Star Strider 2016-8-2
Change the meshgrid call:
a_range = [a1, a2];
b_range = [b1, b2];
c_range = [c1, c2];
av = linspace(min(a_range), max(a_range), 10);
bv = linspace(min(b_range), max(b_range), 10);
cv = linspace(min(c_range), max(c_range), 10);
[M1,M2,M3] = meshgrid(av, bv, cv);
Change the number of vector elements (here 10) in each vector if necessary.

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