How can I plot a function with a conditions in a simple way?

i want to plot this separated function:

I was able to plot the function graph using this method :

clear all
clc

w1=0:1:5000;
w12=-5000:1:0;

M1=-w1.*(w1-5000);
M12=-w12.*(w12+5000);

plot(w1,M1,'b',w12,M12,'b');
xlabel('w')
ylabel('M')

and all good...

but i tried another simple logic method:

clear all
clc

w=-5000:1:5000;
if(w>=0 && w<=5000)% here i have a problem with "w" -with orange underline
    
    M1=-w.*(w-5000);
else
   M1=-w.*(w+5000); 
    
end
plot(w,M1,'b');
xlabel('w')
ylabel('M')

and it's not working...why? what is the problem? there is an option to plot this function with conditions?

this is the error message:

"Operands to the || and && operators must be convertible to logical scalar values.

Error in Untitled15 (line 5)

if(w>=0 && w<=5000)"

Answer 1

[madhan ravi]

w = -5000:5000;
M = -w.*(w-5000) .* (w >= 0 & w <= 5000) +...
    -w.*(w+5000) .* (w >= -5000 & w <= 0);
plot(w,M)

[ron tzuberi]

ok...that is so simple (:

thank you very much! you helped me