problem with command solve inside a function.

2012 2 14
1 个回答
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Hi I have a problem using command solve in a function. My codes are:
function [a]=test(ka,landa)
sym x
y = (ka/landa)*((x/landa)^(ka-1))* (2^(-(x/landa)^ka));
LO = diff(y);
sf=solve(LO,x);
tt=length(sf);
if(tt>1)
a= double(sf(2));
end;
if(tt ==1)
a=double(sf(1));
end;
end
when I run this function with test(2.22,0.90), I get the answer 0.81 and tt=4, but when I call this function in another function I got 0 and the tt=1.
could you please help me with this? by the way I use MATLAB R2011a.
tanx
sasi

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 采纳的回答

Andrew Newell
Andrew Newell 2012-2-14

0 个投票

When I try running this function
function [a,tt] = runtest(ka,landa)
[a,tt] = test(ka,landa);
I get the same answer for both of the following commands:
[a,tt] = test(ka,landa)
[a,tt] = runtest(ka,landa)
(after fixing the top line of the function, which should be syms x).

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