MATLAB: Making a 3 Variable Function Into a 1 Variable Function

equationsymbolic

Hello,

I have created the following simple function of the variable x,a, and b

f = 2*x – a – b.

What I want to do is set a and b equal to some constant values, for example a = b = 1. Now that I have set a and b equal to constants, my question is, how do I make this into a new function with just the variable x? For a = b = 1 , the new function should be 2*x – 2 . I want to do this so that I can use fzero to solve this new function numerically for x. Any help would be much appreciated.

Best Answer

Hi,

have a look at the documentation. So basically

function f=my_fun(x,a,b)
f = 2*x - a - b;

Then you do:

f=@(x) my_fun(x,1,1)

And you call it with f(2) for example.

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MATLAB: Evaluating a function defined by “sym” command

Use subs:

syms a b x
f = a*x^2+b*x;
subs(f,{a,b,x},{1,2,magic(3)})

And for more info:

doc subs

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variant use cell array

X=rand(20,1)
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p = mat2cell([X Y],ones(20,1),2)

bad version

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So do not ever! Use the better 'p{1}' of the first variant instead of 'p1'

Best Answer

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