why do I still get error with syntax

Can someone please tell me what I am doing wrong!!

%Purpose:Plot using ezpolar function
%set value for variables
p=1000;
e=0.25;
%create function handle
r=@theta  p\(1-(e*cos(theta)))
%use ezpolar to plot function
ezpolar(r)

I keep getting this error

Error: File: plot_using_EZZ_polarr.m Line: 6 Column: 11

Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error.

To construct matrices, use brackets instead of parentheses.

Answer 1

[KSSV]

p=1000;
e=0.25;
%create function handle
r = @(theta) p\(1-(e*cos(theta)))    %<--- bracket is needed here 
%use ezpolar to plot function
ezpolar(r)

[Aminata camara]

how should I put the bracket ?

[KSSV]

I have already included the bracket.....did you run the code?

[Aminata camara]

it did not work at first then when I close matlab and reopen it now it works thank you