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make my curve smooth

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fouad koudsi
fouad koudsi 2019-8-5
回答： Star Strider 2019-8-6
Hello,
Due to low sample rate my curve is not coming smooth, so I want to make it smooth
This is the code I am writting:
filename = 'All Data_10mm.xlsx';
%
sheet = '10 mm_1hz_0V_Test1'; % add sheet number
xlRange = 'B80:B101'; % X range
ylRange = 'E80:E101'; % Y range
[Disp, text, raw]= xlsread(filename,sheet,xlRange);
[force, text, raw]= xlsread(filename,sheet,ylRange);
plot(Disp,force,'-r')
hold all
grid on
grid minor

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采纳的回答

Star Strider
Star Strider 2019-8-6
This is as close as I can get to what you want:
filename = 'All Data_10mm.xlsx';
sheet = '10 mm_1hz_0V_Test1'; % add sheet number
xlRange = 'B80:B101'; % X range
ylRange = 'E80:E101'; % Y range
[Disp, text, raw]= xlsread(filename,sheet,xlRange);
[force, text, raw]= xlsread(filename,sheet,ylRange);
plot(Disp,force,'-r')
hold all
grid on
grid minor
[minx,idx1] = mink(Disp,3);
[maxx,idx2] = maxk(Disp,2);
idxv = sort([idx1; idx2]);
for k = 1:numel(idxv)-1
xi = [idxv(k), idxv(k+1)];
Dispv(k,:) = linspace(Disp(xi(1)), Disp(xi(2)), 150);
% qx = Disp(xi(1):xi(2))
% qy = force(xi(1):xi(2))
forcev(k,:) = interp1(Disp(xi(1):xi(2)), force(xi(1):xi(2)), Dispv(k,:), 'pchip');
end
figure
plot(Dispv', forcev')
grid
title('‘pchip’ Interpolation')
producing:
make my curve smooth - 2019 08 05.png
Feel free to experimant with it.

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