MATLAB: Symbols vs Floating points

doublefloating pointMATLABsym

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?

Best Answer

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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MATLAB: Error using odearguments??

The message means, that the subfunction odearguments recieves non-float values, although it needs this type. The message is actually clear in this point.

Are tspan or x0 both floating point types? You can check this by:

class(tspan)
class(x0)

MATLAB: Check a variable is a symbolic or a double

 syms a
 b=10
 class(a)
 class(b)

Best Answer

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MATLAB: Error using odearguments??

MATLAB: Check a variable is a symbolic or a double

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