MATLAB: How to use the input command to ask the user to enter an equation

inputMATLABvariable

I want to write a command which will allow the user to enter an equation in terms of x and also, ask the user to enter the value of the variable x.

Best Answer

See this example

str = 'sin(x)*exp(x)'; % input function in term of x
f = str2func(['@(x)' str]); % convert to MATLAB function
x = 2; % evaluate at x=2
f(2) % evaluate the function

Related Solutions

MATLAB: Input equation from user

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.

MATLAB: User Input of Numerical Value

for K = 1 : 5
  x(K) = input( sprintf('Enter the dectector%d x coordinate', K) );
end

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Related Solutions

MATLAB: Input equation from user

MATLAB: User Input of Numerical Value

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