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Help in creating function , built in equation

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Ali Tawfik
Ali Tawfik on 23 Aug 2019
Commented: Walter Roberson on 24 Aug 2019
Hi All,
I am trying to build in function, including equation which is a result of another code,
I understand function is a separate script but I just need to do something smart, no to add the equation in every time ,
below is the code:
clear all;
clc;
syms x y;
an=solve(-15== 10*x+2*y,y);
ap=solve(10*x+2*y ==20,y);
yin=[an,ap]
damontwo % Name of the function
%% function
function damontwo(x)
x=input('please enter number ')
yin(:,1)=input('Enter equation to solve ')
end
When I type an: I got an error ?, however, when I type equation, it works, so could anyone please help me, how could I introduce that to the function ?
Thanks,

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Answers (1)

Walter Roberson
Walter Roberson on 23 Aug 2019
syms x y;
eqns = damontwo(x,y);
solve(eqns)
%% function
function yin = damontwo(x,y)
yin(1) = input('Enter first equation to solve ');
yin(2) = input('Enter second equation to solve ');
end

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Walter Roberson
Walter Roberson on 24 Aug 2019
I do not understand what you need. What does it mean to type it as a variable but not as an equation? Have have something as a result of a previous equation? Okay, what form is that in? Is a symbolic expression? Is it a character vector?
Ali Tawfik
Ali Tawfik on 24 Aug 2019
Thanks Walter, I mean yin(:,1)=an
(an) is a result of a previous equation
clear all;
clc;
syms x y;
an=solve(-15== 10*x+2*y,y);
ap=solve(10*x+2*y ==20,y);
yin=[an,ap]
damontwo % Name of the function
%% function
function damontwo(x)
x=input('please enter number ')
yin(:,1)=input('Enter equation to solve ')
end
Walter Roberson
Walter Roberson on 24 Aug 2019
Why are you bothering to prompt at all? Why not use an if you have it already?

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