i am trying to make a calculator in matlab gui and i add + or - and i want to add int and diff so i write the 5 lines of codes

syms x;

input=get(handles.edit3,'string');

input = strcat('@(x) ',input);

fx=str2func(input);

c=int(fx,x);

set(handles.text2,'string',char(c));

i write the 5 lines but not this one input = strcat('@(x) ',input); when i added this one my int and diff start working inside the gui what i am not geting is what is this starcat do for the int and diff and what is the @'x' mean

Answer 1

[Mehmed Saad]

Anonymous Functions

suppose i want to create an anonymous function which subtract two inputs

An_fn = @(x,y) x-y;

It is equivilant to

function op = Not_An_fn(x,y)
op = x-y;
end

An_fn(1,2)

and

Not_An_fn(1,2)

will give you same output

str2func converts the string into anonymous function

suppose my string is 'x-y'

so i need to define the input arguments by @(x,y)

strcat is concatenating the input argument with the string 'x-y'

user_string = 'x-y';
strcat('@(x,y)',user_string)
ans = 
 '@(x,y) x-y'

Now if we apply str2func to convert it to anonymous function

fh =  str2func(strcat('@(x,y)','x-y'))
 fh =

  function_handle with value:

    @(x,y)x-y

[Bader Herzallah]

ser_string = 'x-y';

strcat('@(x,y)',user_string)

ans =

'@(x,y) x-y' so in this one u made function with @(x,y) then u add to it the eqation x-y then u change it from str2fun right?

[Mehmed Saad]

Yes