Problem with the code

Hey i got this code and trying to make a graph out of it in Matlab but it wont work, do anyone know why it wont accept it?

f = @(x) 51*x - ((x^2 + x + 3/100)/(2*x + 1))^7 - 17*x*exp(-x)
x= 0:0.1:5
plot(x,y(x))

this is what i get

Error: File: Matlab_labb1.m Line: 26 Column: 4

Invalid expression. Check for missing or extra characters.

Answer 1

[Rik]

You should check the rest of the file, because this is not the part of your code that will trigger that issue. There are some things that will trigger an error:

• In your call to plot you're using y, but your function is defined as f.
• You are using matrix products, divisions, and powers, but your input is a vector. If you want element-wise operations replace ^ / and * by .^ ./ and .*.
• This one will not trigger an error, but is still worth noting: you didn't put semicolons at the end of your lines to supress the output.

[Tobias Pekola]

Could you write the correct code so i can see where exactly i should put the dots?

[Rik]

f = @(x) 51*x - ((x^2 + x + 3/100)/(2*x + 1))^7 - 17*x*exp(-x)
%          ^       ^         ^    ^  ^       ^        ^
%   all these should be replaced with the element-wise version

(17*x is fine, because 17 is a scalar)