# function or functions of a single variable

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Friend, if one of the answers helped you, mark it as the accepted answer to help other users with issues like this.

Ameer Hamza on 25 May 2020
You need to pass a function handle
fplot(@(x) -exp(-x)+x.^2+2*x+2, [0 1])
Walter Roberson on 25 May 2020
In current releases, character vectors are still accepted, but in future that facility will go away.
The real problem was that e is not going to be recognized as the base of the natural logarithms, so e and x would both be considered to be variables.

Walter Roberson on 25 May 2020
Edited: Walter Roberson on 25 May 2020
fplot('-exp(-x)+x.^2-2*x+2',[0 1])
As far as fplot() is concerned, e is just another variable, and not the base of the natural logarithms.

The problem you are not defining the function used in fplot as an expresion with an specific variable. You also are trying to use 'e' as the 'exp()' function.
Try something like this:
% Define x as the variable of the function with @(x)
fplot( @(x) -exp(-x + x.^2 - 2*x + 2), [0, 1]);
Maybe the function is not correct but you only have to change it according to your needs.