How can I plot 2D surface plot with color bar

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Ambali Odebowale
Ambali Odebowale 2022-12-12
评论： Star Strider 2022-12-12
I have an excel file containing 3 variables as attached. I want to plot the variables as a 2D surface plot with the third column representing the color bar. I also attach an example of the plot I am trying to plot.
When I used surf command, I get this error:
Error using surf (line 71)
Z must be a matrix, not a scalar or vector.
Error in PTC_calculation (line 74)
surf(w_ev,beta,PTC)
Thanks
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KSSV
KSSV 2022-12-12
Ran in:
You cannot plot a surface plot with the data you have.
T = readtable('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1227857/DATA.xlsx') ;
x = T.w ;
y = T.beta ;
z = T.PTC ;
scatter(x,y,[],z)

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Star Strider
Star Strider 2022-12-12
编辑：Star Strider 2022-12-12
Ran in:
It is possible to create a surface plot from it, however it is probably not worth the effort —
T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1227857/DATA.xlsx')
T1 = 202×3 table
w beta PTC __________ __________ _______ 0.00012407 628.76 0.14509 0.0050855 25773 0.12082 0.010047 50917 0.13112 0.015008 76061 0.17144 0.01997 1.012e+05 0.21571 0.024931 1.2635e+05 0.25994 0.029893 1.5149e+05 0.30277 0.034854 1.7664e+05 0.34359 0.039816 2.0178e+05 0.38222 0.044777 2.2693e+05 0.41867 0.049739 2.5207e+05 0.45304 0.0547 2.7721e+05 0.48543 0.059662 3.0236e+05 0.51597 0.064623 3.275e+05 0.54477 0.069584 3.5265e+05 0.57192 0.074546 3.7779e+05 0.59753
figure
stem3(T1{:,1}, T1{:,2}, T1{:,3})
xlabel('w')
ylabel('\beta')
view(60,30)
title('Original Data')
N = size(T1,1)*10;
wv = linspace(min(T1.w), max(T1.w), N);
betav = linspace(min(T1.beta), max(T1.beta), N);
PTCv = linspace(min(T1.PTC), max(T1.PTC), N);
[Wm,Bm] = ndgrid(wv, betav);
PTCm = griddata(T1.w, T1.beta, T1.PTC, Wm, Bm);
PTCm(isnan(PTCm)) = 0;
figure
surf(Wm, Bm, PTCm, 'EdgeColor','interp', 'FaceAlpha',0.5)
colormap(turbo)
colorbar
xlabel('w')
ylabel('\beta')
view(60,30)
title('Interpolated Surface Plot Of Original Data')
figure
surf(Wm, Bm, PTCm, 'EdgeColor','interp', 'FaceAlpha',0.5)
colormap(turbo)
colorbar
xlabel('w')
ylabel('\beta')
view(-15,45)
title('Interpolated Surface Plot Of Original Data')
EDIT — Corrected typograp[hical errors.
.
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