Plotting graphs with functions in if loop

Question

Sushant Singh 2021-2-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/755364-plotting-graphs-with-functions-in-if-loop

评论： Sushant Singh 2021-2-24

采纳的回答： Matteo Pellegri

在 MATLAB Online 中打开

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

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Answer 1

Matteo Pellegri 2021-2-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/755364-plotting-graphs-with-functions-in-if-loop#answer_632479

编辑：Matteo Pellegri 2021-2-24

在 MATLAB Online 中打开

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')