error size regarding contour plot

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Hossein
Hossein 2024-1-31
回答： Mathieu NOE 2024-1-31
I wan to plot a contour by using this code:
fileName = 'Simulation.txt';
nPitch = 202;
nTSR = 250;
%% Read in text file
fileID = fopen(fileName);
raw = textscan(fileID, '%f%f%f%f%f%f%f%f%f%f', 'Headerlines', 7);
fclose(fileID);
pitch = raw{3};
TSR = raw{7};
Cp = raw{8};
Ct = raw{8};
%% Re-arrange data
pitch = pitch(1:nPitch); % use individual values only
TSR = TSR(1:nPitch:end); % use individual values only
Cp = reshape(Cp, nPitch, nTSR, 1); % transform vector into matrix
Ct = reshape(Ct, nPitch, nTSR, 1); % transform vector into matrix
disp(pitch)
It seems number of unique value of pitch and TSR is wrong and this error appears:
Error using reshape Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that dimension. Error in pitch_tsr_cp (line 23) Cp = reshape(Cp, nPitch, nTSR, 1); % transform vector into matrix
as I checked file also in excel I have 250 uniqe TSR value amd 202 pitch uniqe value.
  2 个评论
Mathieu NOE
Mathieu NOE 2024-1-31
hello
it would help if you could share the data file as well
maybe you need to zip it if it's too big (limit = 5 Mb)
Hossein
Hossein 2024-1-31
thank you so much for your answer, here is the main file

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采纳的回答

Mathieu NOE
Mathieu NOE 2024-1-31
Ran in:
hello
I believe this is what you wanted to do
I don't see why you needed the reshape action
unzip('Simulation.zip');
fileName = 'Simulation.txt';
% WIND [m/s] ROT [rpm] PITCH [deg] POWER [kW] THRUST [N] TORQUE [Nm] TSR [-] CP [-] CT [-] CM [-]
% Read in text file
data = readmatrix(fileName);
pitch = (data(:,3));
TSR = (data(:,7));
Cp = (data(:,8));
Ct = (data(:,9));
figure(1),
scatter3(TSR,pitch,Cp,10,Cp,'filled')
% Interpolate the scattered data on the grid. Plot the results.
N = 100;
xd = linspace(min(TSR),max(TSR),N);
yd = linspace(min(pitch),max(pitch),N);
[xq,yq] = meshgrid(xd,yd);
zq = griddata(TSR,pitch,Cp,xq,yq);
Warning: Duplicate data points have been detected and removed - corresponding values have been averaged.
figure(2),
contour(xq,yq,zq,'ShowText','on')
grid on
colorbar('vert')

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