Error creating matlab pcolor

Question

Madison 2023-7-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1999543-error-creating-matlab-pcolor

回答： Voss 2023-7-23

I am running into an error plotting temperature form my file (it contains data from Jan-March)

close all, clear all  clc
% note I've renamed the files, call them what you like but they need to
% have the year in them to load in a loop
fp = 'C:\Users\Madison-Riley\Desktop\Thesis\Environmental_Data\Temperature';
ncdisp(fullfile(fp,'Temp_Q1(2020).nc'))
%look at one file to interrogate and understand dimensions and variables
% test=ncread([filepath,'June2021.nc'],'uo'); whos test
time = ncread(fullfile(fp,'Temp_Q1(2020).nc'),'time'); whos time
ntime=length(time);
lon=ncread(fullfile(fp,'Temp_Q1(2020).nc'),'longitude');
lat=ncread(fullfile(fp,'Temp_Q1(2020).nc'),'latitude');
[LON,LAT]=meshgrid(lon,lat);
bottomT=ncread(fullfile(fp,'Temp_Q1(2020).nc'),'bottomT'); whos utide
% dimensions lon*lat*depth*time
% https://uk.mathworks.com/help/matlab/ref/ncread.html
% try different depth layers here, why is the land extent so different?
bottomTtest=ncread(fullfile(fp,'Temp_Q1(2020).nc'),'bottomT',[1 1 1],[length(lon) length(lat) 1 1]);
close all
pcolor(LON,LAT,bottomT.'), shading flat, colorbar

I get the following Error:

Error using internal.matlab.imagesci.nc/read

COUNT has incorrect number of elements (4). The variable has 3 dimensions.

Error in ncread (line 76)

vardata = ncObj.read(varName, varargin{:});

Error in Temp_Q1_20 (line 22)

bottomTtest=ncread(fullfile(fp,'Temp_Q1(2020).nc'),'bottomT',[1 1 1],[length(lon) length(lat) 1 1]);

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Answer 1

Voss 2023-7-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1999543-error-creating-matlab-pcolor#answer_1277443

在 MATLAB Online 中打开

The error message indicates that the error is generated by this line:

bottomTtest=ncread(fullfile(fp,'Temp_Q1(2020).nc'),'bottomT',[1 1 1],[length(lon) length(lat) 1 1]);

The error is due to the fact that you've specified 3 start values but 4 count values

bottomTtest=ncread(fullfile(fp,'Temp_Q1(2020).nc'),'bottomT',[1 1 1],[length(lon) length(lat) 1 1]);
%                                                            ^^^^^^^                               3 starts
%                                                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 4 counts

just like the error message says: "COUNT has incorrect number of elements (4). The variable has 3 dimensions."