Plotting graphs for scaling analysis

Hello community

I am trying to plot the following functions on one graph (as an example):-

y1=-[(x+0.25)^0.5]/x

y2=0

y3=[(x-0.25)^0.5]/x

I expect to get a continuous graph. The values of x vary from -0.5 to 0.5. I am new to MATLAB so I would appreciate it if some explanation is provided.

clear all,
clc,
dell=0.5;
n=0.5;
x1= linspace(-0.5,0,100);
y1=-((x1+(dell/2)).^(1/n))/x1;
plot(x1,y1,'-o');
hold on;
x2=0;
y2=0;
plot(x2,y2,'-o');
x3= linspace(0.5,0,100);
y3=((x3-(dell/2)).^(1/n))/x3;
plot(x3,y3,'-o');
hold off;

Currently the graph comes out like this

I think the graph should be more like this

Many thanks and regards

Sushant

Answer 1

[Star Strider]

The most common problem I see here on Answers is forgetting to use element-wise division, so (./) instead of (/).

Making those two corrections in ‘y1’ and ‘y3’ —

dell=0.5;
n=0.5;
x1= linspace(-0.5,0,100);
y1=-((x1+(dell/2)).^(1/n))./x1;
plot(x1,y1,'-o');
hold on;
x2=0;
y2=0;
plot(x2,y2,'-o');
x3= linspace(0.5,0,100);
y3=((x3-(dell/2)).^(1/n))./x3;
plot(x3,y3,'-o');
hold off;

It may not be the plot you want (I’m not certain what is going on with that), however it’s likely closer.