Error using surf (line 71) Z must be a matrix, not a scalar or vector.

Question

Nihal 2024-6-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2129636-error-using-surf-line-71-z-must-be-a-matrix-not-a-scalar-or-vector

编辑： Torsten 2024-6-18

I got this error when i write this code;

file_nc = 'data.nc';

% see the description of the nc file using ncdisp

% example: ncdisp(file_nc)

% store the information in a struct

info_nc = ncinfo(file_nc);

sn = ncread(file_nc, 'south_north');

we = ncread(file_nc, 'west_east');

height_ws = ncread(file_nc, 'height');

ws = ncread(file_nc, 'wind_speed_mean');

[we_m , sn_m] = meshgrid(we,sn);

for i=1:length(height_ws)

figure

surf(we_m, sn_m, squeeze(ws(:,:,i))','EdgeColor', 'none')

title(strcat("Wind speed at ", num2str(height_ws(i)), " m"))

view(2)

c1 = colorbar;

c1.Title.String = 'U_{avg} [m/s]';

xlabel('Projected West-East [m]')

ylabel('Projected South-North [m]')

axis equal

axis tight

end

Error using surf (line 71)

Z must be a matrix, not a scalar or vector. The line 71 is "error(surfchk(dataargs{:}));"

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Answer 1

Torsten 2024-6-18

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2129636-error-using-surf-line-71-z-must-be-a-matrix-not-a-scalar-or-vector#answer_1473681

编辑：Torsten 2024-6-18

在 MATLAB Online 中打开

Before your loop insert the commands

size(squeeze(ws(:,:,1))')
size(we_m)
size(sn_m)

For surf to work, all sizes must be the same.

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Nihal 2024-6-18

Thank you for answering but I got the same error again when I did that.

Torsten 2024-6-18

编辑：Torsten 2024-6-18

I told you that the output to the command window for these three values must be equal in order for "surf" to work without error. I did not claim that it solves your problem.

According to what three values you get, you will have to change your code. We cannot help you further because we don't know the content of your data file.

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