Create multi slopes from a profile
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Adi Purwandana
le 7 Mai 2024
Commenté : Star Strider
le 8 Mai 2024
Hello there,
Is there a possible way to create some slopes within a profile? My case: I have a profile containing some group of values separated by nans. My intention is how to create slopes for each group. So, since there are some groups in the profile, there will be some slopes which corresponds to each group.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1689362/image.png)
Please find attached mat file for the data.
Cheers
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Star Strider
le 8 Mai 2024
I am not certain what you want. This code performs a linear regression on the line clusters and then plots it for each of them.
Try this —
load('profiles_z_d.mat')
whos('-file', 'profiles_z_d.mat')
Q = [nnz(isnan(d_x1)) nnz(isnan(z))];
idx = ~isnan(d_x1);
startidx = strfind(idx, [0 1])+1;
stopidx = strfind(idx, [1 0]);
ssidx = [startidx; stopidx];
for k = 1:size(ssidx,2)
G{k,1} = d_x1(ssidx(1,k):ssidx(2,k));
G{k,2} = z(ssidx(1,k):ssidx(2,k));
B(:,k) = [G{k,1}; ones(size(G{k,1}))].' \ G{k,2}.';
end
% B
figure
plot(d_x1, z)
hold on
for k = 1:size(B,2)
rline = [G{k,1}; ones(size(G{k,1}))].' * B(:,k);
plot(G{k,1}, rline, '-r')
text(max(G{k,1})+0.1, max(rline), sprintf('y = %.2f \\cdotx% +.2f',B(:,k)), 'Horiz','left')
end
hold off
xlim([0 20])
title('All Data')
figure
plot(d_x1, z)
hold on
for k = 1:size(B,2)
rline = [G{k,1}; ones(size(G{k,1}))].' * B(:,k);
plot(G{k,1}, rline, '-r')
text(max(G{k,1})+0.1, max(rline), sprintf('y=%.2f\\cdotx%+.2f',B(:,k)), 'Horiz','left')
end
hold off
title('Selected Detail')
xlim([0 5])
ylim([390 415])
.
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