Plotting graphs with functions in if loop

Hello community

I want to plot the graph of fb (on Y-axis) vs x (on X-axis) for the attached code:

The plot that I get is also attached here. As I am new to MATLAB I am sure there are mistakes. Any help will be greatly appreciated.

clear all,
clc,
P=93000 ; 
L=45*10^(-3); 
x= linspace(0,58*10^(-6));
sx=(P/L).*(x); 
sY=22; 
n=0.53 ; 
K=3.9 ;
if sY<sx
    fb=(sx.^-1).*((sx-sY)/K).^(1/n);
else
    fb=0; 
end
plot(x,fb,'-o')

Regards

Sushant

Answer 1

[Matteo Pellegri]

You are using the if condition in the wrong way. You can perform you calculation first and then use array index to set the values of fb to 0 right after.

clear all
clc
P=93000 ; 
L=45; 
x= linspace(0,58,100);
sx=(P/L)*(x); %for scalar multiplication you don't need the .
sY=22; 
n=0.53 ; 
K=3.9 ; 
fb=(sx.^-1).*((sx-sY)/K).^(1/n);
fb(sx<=sY)=0; 
plot(x,fb,'-o')

[Sushant Singh]

Thank you very much!!!