Why can´t plot a line avoinding repeated lines?
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Albert Johan Mamani Larico
on 12 Dec 2020
Commented: Albert Johan Mamani Larico
on 12 Dec 2020
Why the following code doesn´t show the expected lineplot?. Can someone explain to me what's wrong with my code? Thanks
C=0.0893;
a=1.5532;
n=2.9718
x=[2.21 2.24 2.46 2.58 2.12 2.27 3.12 3.7 3.08 2 1.47 2.43 2.16...
3.48 1.61 0.93 1.74 2.3 2.38 2.33 2.38 2.06 2.76 3.5 0.9 2.33...
3 4.31 4.21 2.27 2.16 3.95 2.08 3.42 2.81 3.9 4.87 5.32 3.93...
4.12 5.17 5 5.54 3.11 4.9 5.22 3.48 3.07 2.88 2.32 2 2.7 4 0.33...
3.62 3.47 2 1.92 1.8 1.82 3.39 3.18 3.83 4.11 3.655 2.55 2.22 3.77 2.96];
y=C*(x+a).^n;
plot(x,y)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/458765/image.jpeg)
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Accepted Answer
Cris LaPierre
on 12 Dec 2020
Edited: Cris LaPierre
on 12 Dec 2020
What do you expect? A single line or multiple line series?
Your line looks the way it does because your X values are not linearly increasing. Instead, they increase and decrease in value, which results in your line looking the way it does. The line is drawn in the order your points specify, the first to the second to the third, etc.
Perhaps you don't want a line. Perhaps you just want the data points. In that case, add a linespec to your plot command, or use scatter. If you do want the line, then you'll have to sort your data.
C=0.0893;
a=1.5532;
n=2.9718;
x=[2.21 2.24 2.46 2.58 2.12 2.27 3.12 3.7 3.08 2 1.47 2.43 2.16...
3.48 1.61 0.93 1.74 2.3 2.38 2.33 2.38 2.06 2.76 3.5 0.9 2.33...
3 4.31 4.21 2.27 2.16 3.95 2.08 3.42 2.81 3.9 4.87 5.32 3.93...
4.12 5.17 5 5.54 3.11 4.9 5.22 3.48 3.07 2.88 2.32 2 2.7 4 0.33...
3.62 3.47 2 1.92 1.8 1.82 3.39 3.18 3.83 4.11 3.655 2.55 2.22 3.77 2.96];
y=C*(x+a).^n;
% Set LineSpec
plot(x,y,'o')
% Use scatter
figure
scatter(x,y)
% Sort x data first
x=sort([2.21 2.24 2.46 2.58 2.12 2.27 3.12 3.7 3.08 2 1.47 2.43 2.16...
3.48 1.61 0.93 1.74 2.3 2.38 2.33 2.38 2.06 2.76 3.5 0.9 2.33...
3 4.31 4.21 2.27 2.16 3.95 2.08 3.42 2.81 3.9 4.87 5.32 3.93...
4.12 5.17 5 5.54 3.11 4.9 5.22 3.48 3.07 2.88 2.32 2 2.7 4 0.33...
3.62 3.47 2 1.92 1.8 1.82 3.39 3.18 3.83 4.11 3.655 2.55 2.22 3.77 2.96]);
y=C*(x+a).^n;
plot(x,y)
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