How to plot non equally spaced data in an equally spaced fashion.
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I am trying to plot some data:
x=[10 50 100 500 1000 1500 2000 2500 3000]; %data points
y=[74.6 88.8 89.6 92.1 92.5 88.8 88.8 87.9 85.4]; %accuracy(%)
The problem I am facing is that I cannot plot the data in an equally-spaced grid plot (including the tick locations). This is an example of what I want to achieve:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/160911/image.png)
Thanks for your help in advance. Raul
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Star Strider
am 21 Feb. 2017
See if this does what you want:
x=[10 50 100 500 1000 1500 2000 2500 3000]; %data points
y=[74.6 88.8 89.6 92.1 92.5 88.8 88.8 87.9 85.4]; %accuracy(%)
xt = [10 50 100 500 1000 1500 2000 2500 3000 3500];
xv = 1:length(xt);
yv = interp1(x, y, xt, 'linear', 'extrap'); % Extrapolate The ‘3500’ Value
figure(1)
plot(xv, yv) % Plot Interpolated Values Against ‘xv’
grid
set(gca, 'XTickLabel',xt) % Label Ticks As ‘xt’
ylabel('Accuracy (%)')
If you do not want to extrapolate to 3500, the code would be:
x=[10 50 100 500 1000 1500 2000 2500 3000]; %data points
y=[74.6 88.8 89.6 92.1 92.5 88.8 88.8 87.9 85.4]; %accuracy(%)
xv = 1:length(x);
figure(1)
plot(xv, y) % Plot Interpolated Values Against ‘xv’
grid
set(gca, 'XTickLabel',x) % Label Ticks As ‘xt’
ylabel('Accuracy (%)')
5 Kommentare
楠 赵
am 4 Dez. 2020
I use the script you suggest to plot the figure and I got the figure like this, now I want to present the value from "x" not from "xv", how can I set x axis value from "x" ? this is what I have now:![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/444028/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/444028/image.png)
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KSSV
am 21 Feb. 2017
x=[10 50 100 500 1000 1500 2000 2500 3000]; %data points
y=[74.6 88.8 89.6 92.1 92.5 88.8 88.8 87.9 85.4]; %accuracy(%)
N = 100 ;
xi = linspace(min(x),max(x),N) ;
yi = interp1(x,y,xi) ;
plot(x,y,'r') ;
hold on
plot(xi,yi,'.b')
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