How to plot a 2d contour using 3d source of data (measured and recorded within a spreadsheet)

Question

Mohammad Dabbagh 2021-3-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/779652-how-to-plot-a-2d-contour-using-3d-source-of-data-measured-and-recorded-within-a-spreadsheet

评论： Walter Roberson 2021-3-22

Sample.xlsx

Hi there,

It would be my greatest pleasure if anyone could assist me with plotting a 2d contour from the attached data (derived from an experiment and stored within a Excel file). It would be so much appreciated if you could do me a favor and include all the MATLAB required scriptting. Thanks!

@Ameer Hamza @Guillaume @Walter Roberson @Star Strider

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Mohammad Dabbagh 2021-3-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/779652-how-to-plot-a-2d-contour-using-3d-source-of-data-measured-and-recorded-within-a-spreadsheet#answer_654432

在 MATLAB Online 中打开

Thank you so much for your quick reply. I truly appreciate it.

I tried this code:

t = readtable('C:\Users\moham\Desktop\Sample.xlsx', 'VariableNamingRule', 'preserve');
N = 50;
x = t{:,1};
y = t{:,2};
irrad = t{:,3};
xvec = linspace(min(x), max(x), N);
yvec = linspace(min(y), max(y), N);
[Xg, Yg] = meshgrid(xvec, yvec);
F = scatteredInterpolant(x, y, irrad);
Ig = F(Xg, Yg);
contourf(Xg, Yg, Ig); colorbar

However, it shows me the following eror:

Error using readtable (line 216)
Invalid parameter name: VariableNamingRule.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Walter Roberson 2021-3-22

在 MATLAB Online 中打开

t = readtable('C:\Users\moham\Desktop\Sample.xlsx');

Warning: Column headers from the file were modified to make them valid MATLAB identifiers before creating variable names for the table. The original column headers are saved in the VariableDescriptions property.
Set 'VariableNamingRule' to 'preserve' to use the original column headers as table variable names.

N = 50;

x = t{:,1};

y = t{:,2};

irrad = t{:,3};

xvec = linspace(min(x), max(x), N);

yvec = linspace(min(y), max(y), N);

[Xg, Yg] = meshgrid(xvec, yvec);

F = scatteredInterpolant(x, y, irrad);

Ig = F(Xg, Yg);

contourf(Xg, Yg, Ig); colorbar

请先登录，再进行评论。