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.
采纳的回答
Jos (10584)
2014-4-25
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.
更多回答（2 个）
Manjeet Singh
2016-4-5
编辑：Stephen23
2016-6-24
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 个评论
Sourin Dey
2016-6-24
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
2019-8-9
0 个投票
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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