Why does this code give a blank plot?

code:

for a=1:2:4

x=linspace(-5,5,300);

if (x>=0)

fx3=(x/a^2).*exp((-1/2)*(x/a).^2);

else

fx3=0;

end

figure(6);

plot(x,fx3);

hold on

end

Answer 1

[Sriram Tadavarty]

Hi Keerthana,

It is because the if condition placed is wrong, and always fx3 is getting 0, therby making only a single point.

Updated the code to match what you are trying below:

for a=1:2:4
x=linspace(-5,5,300);
fx3 = zeros(1,length(x)); % Intialize the value to zeros
xPositive = x(x>=0); % Find the values of x which are greater than or equal to 0
fx3(x>=0)=(xPositive/a^2).*exp((-1/2)*(xPositive/a).^2); % Update the value of fx3, when x >= 0
figure(6);
plot(x,fx3);
hold on
end
hold off

Hope this helps.

Regards,

Sriram

[Keerthana R]

Thank you!