Help with script and function

Question

Milad Ahmed 2018-4-14

0
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https://ww2.mathworks.cn/matlabcentral/answers/394932-help-with-script-and-function

编辑： Milad Ahmed 2018-4-14

For my soil mechanics lab I need to plot three Mohr Circle on the same axes. I need help on making this function take any input(s3,s1) (instead of assigning a value to s3 and s1 in the script) and returning the radius of the circle.

function [r,h]= geotech_mohrcirc(s3,s1)
clear all
close all  
clc
s3= 50;
s1= 103.169;
x=linspace(s3,s1,1000);
r=(s1-s3)/2;
h=(s1+s3)/2;
y=abs(sqrt(r^2-(x-h).^2));
plot (x,y)
axis equal
grid on
axis([0,s1+r,0,1.25*r])
xlabel('Normal stress \sigma_n (kPa)')
ylabel ('Shear stress \tau (kPa)')
end

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Answer 1

Walter Roberson 2018-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/394932-help-with-script-and-function#answer_315131

Get rid of the "clear all". Once you do that then you can remove the assignments from the script. The "clear all" is erasing the parameters that are passed in.

I also recommend getting rid of the "close all" and "clc".

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Rik 2018-4-14

The inclusion of clear all,close all,clc is a prime example of cargo cult programming. If you don't actually need to clear everything, don't use clear all. If you want to clear variables in a script, use clearvars instead at the very least. M-lint also generates a warning for this. You should really try to resolve every warning. You can suppress warnings you decide not to resolve by including %#ok after that line. That way, you can easily keep track of any new warnings.

Milad Ahmed 2018-4-14