Why y6(x)=e^[(-ax)]^2 didin't work

I want to calculate it, but it doesn't work :/

y6(x)=e^[(-ax)]^2

Answer 1

[Jan]

Welcome to Matlab!

"It doesn't work" is not a useful description of the occuring problem. Post the error message instead or explain the difference between the result and you expectations.

I see 3 problems:

• What is "e" in e^[(-ax)]^2?
• "ax" is not the same as a * x.
• y6(x) will not work in general, if x is not an integer > 0.

I guess:

y = exp(-a * x.^2)

These are programming fundamentals in Matlab. Please read the Getting Started chapters and look at Matlab's Onramp. This is more efficient to ask for the basics in the forum.

Answer 2

[Walter Roberson]

1. MATLAB has absolutely no implied multiplication, not anywhere. If you want to multiply a and x then you need to put a multiplication operator between the two names. For this purpose, the multiplication operator to use use .* (period followed by asterisk), such as a.*x
2. The equation asks you to take the square of x, not the square of (-ax) .
3. For this purpose you will probably need to use the .^ operator instead of the ^ operator
4. In MATLAB, [] is only used to build lists, such as [1, 1, 2, 3, 5, 8] . You should use () for prioritization.
5. In MATLAB, is written as . You will find that to be quite common across different programming languages
6. Having the (x) on the left side is not going to work if x is numeric, and you should instead be creating anonymous functions in such a case, such as y = @(x) sin(x.^2-1) . It is valid to have y(x) on the left hand side if x has been defined as a symbolic variable