How to construct handle from input string (anonymous function) ?

This what I've got so far: Apparently something goes wrong here...

function anon = myIntegrator(X, fun)
fun = input('enter an equation (for example x.^2): ', 's');
X = input('enter variable, separated by comma: ', 's');
%z = input('enter function limit (for example -2,2): ', 's');
anon =  str2func(['@(',X,')',fun]);
end

Do I need to use something like regexp or str2double? How and when?

Many thanks in advance Bar

Answer 1

[the cyclist]

You need to define the function handle first, and then evaluate it for the argument. I don't think you can do that all in one step.

Also, because you are asking for the inputs from the console, I took them out of the function call of myIntegrator. Here is the code I used. Just call it with "myIntegrator()".

function output = myIntegrator()

fun = input('enter an equation (for example x.^2): ', 's');
X = input('enter variable, separated by comma: ');

anon = str2func(['@(x)',fun]);

output = anon(X);

end

[Bar Avni]

Thank!

what if I wish to enter more than one variable?

[Walter Roberson]

anon = str2func(['@(x, y)',fun]);

[Skyler Kolb]

how could would I be able to do

anon(x+h)

[Skyler Kolb]

I figured it out

x = 2;
h = 3;

z = x + h;
f(z); %f(z) = f(x+h)

[Walter Roberson]

You would call anon passing in a value for x+h