Syntax Error: Unknown Function

2013 5 29
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Hi, for the following code:
n = 50000;
g = 0.3;
x = [];
for i=1:n
k = 0;
while unifrnd(0,1) < g
k = k + 1;
end
b = 0;
mynumber = 2;
for j = 1:k
switch mynumber
case 1
v = random(beta,3,3)
case 2
v = random(gam,5,5)
case 3
v = random(exp,3)
case 4
v = random(geo,0.2)
case 5
v = random(unif,0,5)
case 6
v = random(norm,0,1)
end
b = b + v;
end
if b ~= 0
x = [x, b];
end
end
I get the following error: Undefined function or variable 'gam'.
Error in test (line 21) v = random(gam,5,5)
why is that? Thanks

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Azzi Abdelmalek
Azzi Abdelmalek 2013-5-29

0 个投票

You can tell us what is the value of gam?

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MiauMiau
MiauMiau 2013-5-29
gam(5,5) should be a gamma random variable with shape and scale parameters equal to 5. So I always add one sort of random variable to b.
Azzi Abdelmalek
Azzi Abdelmalek 2013-5-29
Maybe you should use 'gam' instead of gam
Azzi Abdelmalek
Azzi Abdelmalek 2013-5-29
编辑：Azzi Abdelmalek 2013-5-29
You can't use
v = random(beta,3,3) % you missed ' '
it should be
v = random('beta',3,3)
The same remark for the other options gam, geo,norm,...
MiauMiau
MiauMiau 2013-5-29
ah..so that's it. I will try it
MiauMiau
MiauMiau 2013-5-29
works, thanks!

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MiauMiau
MiauMiau 2013-5-29
The path is set, so it is not a problem with the path but it must be some syntax error
see, You hav to declare the variable 'gam' and others as global or local, then only you can call it..
MiauMiau
MiauMiau 2013-5-29
But "gam" is just an already defined distribution in matlab...as "normrnd(.." since when has this decleration to be done? And where do I have to do it?

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