how to creat Multiplication table

Bob
2012 11 15
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I'm trying to creat a multiplication table for the following
f=[5:.332:55];
omegahz=(2*pi)*f;
amp=0:0.01:1.5;
My attempt was
f=[5:.332:55];
omegahz=(2*pi)*f;
amp=0:0.01:1.5;
for n=1:151
omegan =omegahz(1,n)
ampn= amp(1,n)
g(ampn,omegan)=ampn*omegan
end
so I think I have to call on the location not the value so I tried this
f=[5:.332:55];
omegahz=(2*pi)*f;
amp=0:0.01:1.5;
for n=1:151
omegan =omegahz
ampn= amp
g(ampn,omegan)=ampn.*omegan
end
and get this
??? Subscript indices must either be real positive integers or logicals.
Error in ==> Untitled3 at 10
g(ampn,omegan)=ampn.*omegan
I'm Not sure how to proceed on this one, Your help Is appreciated. Thanks

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Matt Fig
Matt Fig 2012-11-15
编辑：Matt Fig 2012-11-15

0 个投票

I am not quite sure if this is what you want, but have a look at this:
A = 1:5;,
B = 1:10;
C = bsxfun(@times,A,B.') % Also try bsxfun(@times,A.',B)
The error you got is easy to understand. You cannot index into an array with anything but a nonpositive integer or logical. Think about it. Consider this array:
A = [10 11 12];
What is the first element? A(1) is 10. What is the second element? A(2) is 11. What about the third element? A(3) is 12. So what element is A(2.23)? NONE.

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Bob
Bob 2012-11-17
thanks, so I'm testing using the first 5 values to see if I get my table, when I try it with the values of k,n to creat (test) I get the correct table but when I use my w2,a to creat (ac)table I get the columns of the same value
a=[0:.001:.015];
w=[10*pi:6.13:100*pi];
w2=w.^2;
amax=.18*9.81;
%a=a';
for k=1:5 ;
for n=1:5 ;
test(k,n)=k*n
y=w2(1,n);
x=a(1,n);
ac(k,n) = bsxfun(@times,x,y.') ;
end
end
end
end
Matt Fig
Matt Fig 2012-11-17
Bob, did you look at the output of my code? Why are you trying to use BSXFUN on two scalar values? x and y are both scalars, but BSXFUN is for vectors.
If 'test' is the array you want, and you already can get it, what is your question about? Are you looking for this:
ac = bsxfun(@times,a(1:n),w2(1:n).'); % Not in a loop!
You need to explain what you want at the end, given those inputs.
Bob
Bob 2012-11-17
编辑：Bob 2012-11-17
I was confused on where I was going with it. now im still confused but I know where I'm going with it. Initially I though bsxfun was't what I needed and thought 2 for loops might give me what I need.
I have a machine with 2 inputs:
1. amplitude Range(0,0.015)
2.Freq Range(5,55)
Equation:
w=Freq*2*Pi
Acceleration=Amp*W^2
that's why i wanted the Table for
After I get my table I need to extract the (AMP,W)Pairs that generates acceleration =1.76
I Created the table using Excel and compared it my results from mat lab, I found that my interval for w and w^2 are not of equal size, and thats why my results don't match.
this is the excel sheet I'm using :
https://docs.google.com/open?id=0B6m94M0Cqc9Ad3B3RmdNamZEQ1E
here is my latest code, still trying to get
a=[0:.001:.015];
w=[10*pi:6.2:100*pi];
w2=w.^2;
amax=.18*9.81;
C = bsxfun(@times,w2,a.') % Also try bsxfun(@times,A.',B)
Thanks

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