Mathematical calculations on input equation

I want to write a program where user should be able to enter equation function of 1 variable. such as sin(t)-2t , but this equation is used in further calculations but i can't make this because the type of it is string. how can i solve this problem or change the type of input data to make mathematical calculations ?

Answer 1

[bio lim]

What do you mean by function? Is it simply asking for a numerical input? If so,

f=input('enter input num\n')

[Mohamed ahmed]

i meant that the user's func may be sin(t)-2t how can i make calculations on this equation and plot it

[bio lim]

Then you can do it using str2func

f = input('Enter the function:\n', 's');
fh = str2func(['@(t)' f]);|

Let's check it.

Enter the function:
2*t + 3*t
>> fh(2)

ans =

      10

[Patrik Matta]

Hi, I would like user to input function i.e. x^2 + 3*y^3 and then ask user for the value of x and y and get the value of the function for x and y. I have been looking foor an advice on various sites but nothing has worked for me. I have MATLAB R2020b.

[Steven Lord]

Use str2func. See bio lim's comment from November 28, 2016 for an example.

Answer 2

[prinesh patel]

how can i get this equation on matlab and then get the answer or any value of (t)

q(t)= (6.25* 10^9)/(t+500)^3

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/523391-mathematical-model-into-matlab