input equation from user
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Hi, I am a new user for MATLAB and I have R2010a version. I want to write a program where user should be able to enter euqation as input. e.g. : 5x^2 + 2x =8. And once the equation is fed in, I want to find out value of the equation for a perticular x value.
Please help.
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Accepted Answer
Jos (10584)
on 25 Apr 2014
str = input('Give an equation in x: ','s') ;
% the user types in, for instance 2*x^2-3*x+4
x = input('Type in a value of x: ') ;
% the user types in, for instance, 2
f = inline(str,'x') ;
y = feval(f,x) ;
disp(['"' str '", for x = ' num2str(x) ', equals ' num2str(y)]) ;
This will error when the string cannot be converted to an inline function or when the function cannot be evaluated for the value entered by the user.
More Answers (2)
Manjeet Singh
on 5 Apr 2016
Edited: Stephen23
on 24 Jun 2016
str = input('Give an equation in x and y: ','s'); % the user types equation in form of x and y
f = inline(str,'x','y') % This gives function in form of f(x,y) $ both value of x and y can be put like f(2,3)
1 Comment
Sourin Dey
on 24 Jun 2016
Can you kindly show me the way to read the coefficients from the input equation? (The equation will be taken using input function)
Mohammed Alrajeb
on 9 Aug 2019
hi every one
i need to your help
i need to enter 4 input (decimal number) and convert to binary number 32bit how can do that?
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