MATLAB: Coordinates from a fitted curve

coordinates from a fitted curvecurve fitting

Hi,

I have some data, I want to just connect the data together. I used "linearinterp". now, I would like to have the data from the fitted curve. I mean, my data are discrete, by "linearinter" I made a continuous curve wich fills the gaps between my data. now I want to read the coordinates of the new graph, even those which are not presented as my data.

Could anyone help me please?

Thanks

Best Answer

The "linearinterp" function appears to be an R function.

Use interp1 in MATLAB. Since you have to define the independent variable interpolation points as an input argument, you will have those and the interpolated points as the output from interp1.

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MATLAB: Find peak and plot graph from peak

I am not certain what you want to do.

If you want to get the peaks and their indices, request those outputs:

[pks,locs] = findpeaks(pure_brain(:,2));                    % Get Peaks (‘pks’) and Peak Indices (‘locs’)

I have no idea what is in your data file, however if you want to plot them and indicate them, try this:

x = 1:size(pure_brain,1);
figure
plot(x, pure_brain(:,2))
hold on
plot(x(locs), pure_brain(locs,2), '^r')
hold off
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MATLAB: How to find peaks for a graph plotted in semi-log axes and to extract the values of peak and FWHM

Use findpeaks with more than 2 outputs:

[pks,locs,widths,proms] = findpeaks(PeakSig,x);

See the documentation section on Peak Prominences (link) for details. It specifically describes the ‘widths’ output as ‘Display the prominences and the widths at half prominence of all the peaks.’

Best Answer

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MATLAB: Find peak and plot graph from peak

MATLAB: How to find peaks for a graph plotted in semi-log axes and to extract the values of peak and FWHM

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