problem using command solve?!
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Hi
I have a problem using command solve. when I write these commands on the command window, I get 4 answers for m equation.
ka=2;
landa=4;
syms x
y = (ka/landa)*((x/landa)^(ka-1))* (2^(-(x/landa)^ka));
LO = diff(y);
sf=solve(LO,x)
but when i use these same codes in my m.file I have get errors regarding mupad. Moreover I can access to the first answer of sf, not all of them.
Does anybody why this happen?
tnx
sasi
回答（1 个）
Friedrich
2012-2-14
Hi,
when I run your code from the command window I get two solutions:
ka=2;
landa=4;
syms x
y = (ka/landa)*((x/landa)^(ka-1))* (2^(-(x/landa)^ka));
LO = diff(y);
sf=solve(LO,x)
sf =
(2*2^(1/2))/log(2)^(1/2)
-(2*2^(1/2))/log(2)^(1/2)
Running it in a script or functions works fine too. What error do you get? Which version of MATLAB are you using?
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