Smoothing curve with duplicate values using pchip

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Rosemaryl21 2020-8-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/577774-smoothing-curve-with-duplicate-values-using-pchip

编辑： Rosemaryl21 2020-8-10

I have been using pchip interpolation to smooth curves plotted from data points. This has worked fine except I can't figure out how to smooth the curve when there are duplicate x values. This is what I have now:

Pressure27 = TC27Data.Pressurepsi;
Efficiency27 = TC27Data.Efficiency;
[xUnique, ia, ic] = unique(Pressure27);
yMeans = accumarray(ic, Efficiency27, [], @mean);
xq27 = [1500:.001:1250];
yqp27 = pchip(xUnique,yMeans,xq27);
plot(xUnique,yMeans,'linewidth',2);

This is mostly not my original code, I found it on this forum here.

This successfuly plots the averaged data point where there were duplicate values, however the curve that plots is not as smooth as I would like it, I want to get rid of the linear jagged edges. How can I use pchip here to smooth the curve? Thanks!