Symbols vs Floating points

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Richard
Richard 2012-3-28
This question has to do with the question in this link which Jan has kindly shed some light on.
http://www.mathworks.co.uk/matlabcentral/answers/33744-error-using-odearguments
As mentioned in my comment, I am wondering why my x0 is of class 'sym'. I tried playing around with it and discovered that the problem lies with c0=f(a0,b0).
But I don't know what I can do with it to make it a 'double'. The thing is c0 is a number, no?
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Richard
Richard 2012-3-28
Thanks, Jan.
f = @(a,b) diff(100*a^5+b, sym('a'));
a0=10;
b0=10;
c0=f(a0,b0);
x0 = [a0,b0,c0];
The curly brackets aren't actually there (though the square ones are) -- I thought that using the curly ones in this forum gives the code font -- sorry it is really me being stupid!
Jan
Jan 2012-3-28
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Jan
Jan 2012-3-28
Your f contains the term "sym('a')". Therefore the results get the type sym also. Perhaps you want to use the command double to make the symbolic expression numerically.

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