how can i compare 3 different columns of an Excel sheet with contourf plot in Matlab GUI

2 次查看（过去 30 天）
Darshil Pragneshbhai Trivedi
编辑： Cris LaPierre 2022-1-12
Hello all, nowadays i am making a GUI through matlab designer to compare different parameters, i have to compare 3 different columns of Excel sheet with contourf plot. And I am getting error of 'Error using contourf (line 57) Z must be at least a 2x2 matrix.'
Thank you all in advance, please help me out, i am stucked with my task.
here is my code:
Parameter = readmatrix('GUI1.xlsx');
Parameter1 = Parameter(51*1);
Parameter2 = Parameter(51*2);
Parameter3 = Parameter(51*3);
Parameter4 = Parameter(51*4);
if (strcmp(app.XAchseParameterDropDown.Value,'DE'))
X = Parameter1;
elseif (strcmp(app.XAchseParameterDropDown.Value,'DI'))
X = Parameter2;
elseif (strcmp(app.XAchseParameterDropDown.Value,'DrE'))
X = Parameter3;
else
X = Parameter4;
end
if (strcmp(app.YAchseParameterDropDown.Value,'DE'))
Y = Parameter1;
elseif (strcmp(app.YAchseParameterDropDown.Value,'DI'))
Y = Parameter2;
elseif (strcmp(app.YAchseParameterDropDown.Value,'DrE'))
Y = Parameter3;
else
Y = Parameter4;
end
if (strcmp(app.ZAchseParameterDropDown.Value,'DE'))
Z = Parameter1;
elseif (strcmp(app.ZAchseParameterDropDown.Value,'DI'))
Z = Parameter2;
elseif (strcmp(app.ZAchseParameterDropDown.Value,'DrE'))
Z = Parameter3;
else
Z = Parameter4;
end
contourf(app.UIAxes,X,Y,Z)

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回答（1 个）

Cris LaPierre
Cris LaPierre 2021-12-24
编辑：Cris LaPierre 2021-12-24
Ran in:
A contour plot is created from a matrix (Z data; see here). You must be giving it a vector, causing the error message you see.
You can learn more and see examples in the contourf documentation page.
% Works
x = -2:0.2:2;
y = -2:0.2:3;
[X,Y] = meshgrid(x,y);
Z = X.*exp(-X.^2-Y.^2);
contourf(X,Y,Z,'ShowText','on')
% recreates the error you are seeing
x = -2:0.2:2;
y = -2:0.2:3;
[X,Y] = meshgrid(x,y);
Z = X.*exp(-X.^2-Y.^2);
contourf(X,Y,Z(:),'ShowText','on')
Error using contourf (line 57)
Z must be at least a 2x2 matrix.
How you convert your column data to a matrix is going to depend on your data. It's very difficult to answer that question withough more information.
  2 个评论
Cris LaPierre
Cris LaPierre 2022-1-12
编辑：Cris LaPierre 2022-1-12
I think you'd have to tell us that. I'm not sure how we would know.
Generally speaking, your X and Y values will be inputs (independent variables) and Z will be your output or response (dependent variable).

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