I want to plot trend line (and want to record its slop) to multiple figures
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UET Hussain
el 23 de Feb. de 2018
Comentada: KSSV
el 23 de Feb. de 2018
Good Day, I have almost 50,000 points single column data. I divided it into 6 equal parts, calculated rms for each part, and want to plot trending curve of each part. For polyfit, I don't have values of x. I don't know why, but lsline is also not showing anything.
T = 6*fix(numel(V1)/6);
six_parts = reshape(V1(1:T),[],6);
for i = 1:6
sp1= six_parts(:,i);
P1 = sp1;
Pa1 = WinSize*fix(numel(P1)/WinSize); %numel(V1) counts number of elements in V1. it is numeL, not 1(one); fix(A) will round the number to nearest intiger
rP1 = rms(reshape(P1(1:Pa1),WinSize,[]),1);
figure;
% h1 = lsline
plot (rP1);
tmean(i) = trimmean(rP1,10)
xlswrite('abc',tmean);
Any suggestion is welcome
3 comentarios
KSSV
el 23 de Feb. de 2018
polyfit gives you slope and y-intercept of your straight line.....using these you need to draw you line.....you are not doing that....
Respuesta aceptada
KSSV
el 23 de Feb. de 2018
Use polyfit like below to draw a line later:
x = linspace(0,4*pi,10);
y = sin(x);
% Use polyfit to fit a line to the points
p = polyfit(x,y,1);
% Evaluate the polynomial on a finer grid and plot the results.
x1 = linspace(0,4*pi);
y1 = polyval(p,x1);
figure
plot(x,y,'o')
hold on
plot(x1,y1)
hold off
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