How can I plot 2D surface plot with color bar
显示 更早的评论
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
1 个评论
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)
采纳的回答
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')
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.
.
6 个评论
Ambali Odebowale
2022-12-12
编辑：Ambali Odebowale
2022-12-12
Star Strider
2022-12-12
What information do you need from it?
Ambali Odebowale
2022-12-12
I must have missed that last night when I first saw this.
T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1227857/DATA.xlsx');
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)) = 1E-8;
figure
contourf(Wm, Bm, PTCm)
colormap(turbo)
% colormap(flipud(turbo))
colorbar
xlabel('w')
ylabel('\beta')
title('Interpolated Surface Plot Of Original Data')
figure
contour(Wm, Bm, PTCm)
colormap(turbo)
% colormap(flipud(turbo))
colorbar
xlabel('w')
ylabel('\beta')
title('Interpolated Surface Plot Of Original Data')
This is the best it is possible to do with the supplied data. If you have more data or a different data set, you may get the result you want. My code should work with it without modification, if the variables in the Excel file have the same names and the same positions in the file.
.
Ambali Odebowale
2022-12-12
Star Strider
2022-12-12
As always, my pleasure!
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Surface and Mesh Plots 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
