Functions in matlab

Question

This looks really simple. I want to define a function:

syms x

f = x^2

I want to be able to do f(4) and it spits out 16. I also want to avoid having to write a new m-file.

Oleg · Accepted Answer · 2013-07-17 20:20:41Z

5

When dealing with symbolic variables, to substitute in a numeric value, use subs(), i.e. symbolic substitution:

syms x
f = x^2

subs(f,4)

answered Jul 17, 2013 at 20:20

Oleg

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NPE · Accepted Answer · 2013-07-17 20:13:14Z

4

>> f = @(x) x^2;
>> f(4)

ans =

    16

answered Jul 17, 2013 at 20:13

NPE

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3 Comments

Oleg Over a year ago

Note that the x in the function handle is NOT the symbolic x you defined.

yankeefan11 Over a year ago

What is the difference?

Oleg Over a year ago

You are creating a function on-the-fly which accepts one input, whose name is specified within the ( ). The name itself can be anything and it will not match base workspace variables since each function has it's own workspace when called.

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