Symbols vs Floating points

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Richard
Richard on 28 Mar 2012
This question has to do with the question in this link which Jan has kindly shed some light on.
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?
  5 Comments
Richard
Richard on 28 Mar 2012
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 on 28 Mar 2012
The formatting in this forum is not intuitive.

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Accepted Answer

Jan
Jan on 28 Mar 2012
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.
  1 Comment
Richard
Richard on 28 Mar 2012
Hi, Jan, Thanks a lot! It is fixed now! :)

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