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How do I make a logamarithic curved line of best fit?

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Jake Elliott
Jake Elliott 2020-10-18
关闭： MATLAB Answer Bot 2021-8-20
This is my Code:
Stim=[200 250 350 600];
Volt_Max=[max(mV200(:,3)) max(mV250(:,3)) max(mV350(:,3)) max(mV600(:,3))];
plot(Stim,Volt_Max,'h')
ylabel('Voltage (mV)')
xlabel('Stimulus Voltage (mV)')
xlim([200 700])
title('Effect of Stimulus Intensity on Active Propagations')
grid on
logx=log(Stim)
logy=log(Volt_Max)
Const=polyfit(logx, logy, 6)
hold on
plot(Stim, exp(polyval(Const, logx)));
I want a curved plot, however, the plot I get becomes this:

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回答（1 个）

Durganshu
Durganshu 2020-10-19
You can manually code the problem to store more intermediate values through interpolation in order to make the curve more smooth. Predefined function pchip can be used for this. Read the documentation here: https://in.mathworks.com/help/matlab/ref/pchip.html
You can also use teh Curve Fitting toolbox for your purpose. Read this documentation: https://in.mathworks.com/help/curvefit/curve-fitting.html
The easiest way to solve this issue and get a smooth curve will be to perform interpolation and obtain more values between two data points (marked with 'o' on the shown graph). This will definitely smoothen the curve.

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