CODEWITHSUNDEEP
matlab
Victor
Victor

Reputation: 14573

Removing some specific characters from Matlab strings

I have recently started programming in MATLAB to create some utilities for myself. I want to create a graphical interface for solving equations.

In the command line I can achieve this simply by:

syms x
result = solve('12*x=24');

( and result is going to be = 2 )

I wanted to improve this process by creating a GUI.

The current program I have looks like this: 

function [ output_args ] = SolveEq( equation )
    syms x a b;
    output_args = solve( equation );

end

This works only for equation that work on x, a and b variables. I want to process the string as follows:

  1. Remove the whitespaces. I found how to achieve this here.

  2. Get the variables out of that string.

    for example: in string '12+a-b=0', I want my program to be able to find that a and b are variables, and also perfom the syms operation for them. How can I achieve this?

Upvotes: 0

Views: 205

Answers (1)

Daniel
Daniel

Reputation: 36710

The syntax you are using works without declaring symbolic variables:

f=solve('12*x=24');

Working with expressions instead of strings require to declare symbolic variables:

syms x
f=solve(12*x==2);

Use strings, then nothing must be done.

Code you need after solving:

if isstruct(f)
  %more than one variable
  names=fieldnames(f);
else
  %only one variable, f is the solution
end

Upvotes: 2

Related Questions