Reference to non-existent field 'data'.

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Laxmi Bhatta
Laxmi Bhatta 2023-3-10
编辑： Stephen23 2023-3-10
P='C:\Users\Lenovo\OneDrive\Desktop\NB_veh_files';
>> S=dir(fullfile(P,'*.csv'));
>> for K=1:numel(S)
F=fullfile(P,S(k).name);
S(k).data=readmatrix(F);
end
>> figure
>> hold on
>> for k=1:1388
plot (S(k).data(:,1), S(k).data(:,4),'black','LineWidth',0.1)
end
Reference to non-existent field 'data'.
Can anyone help me how to update the code so that I don't get the error message
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Stephen23
Stephen23 2023-3-10
编辑：Stephen23 2023-3-10
"'C:\Users\Lenovo\OneDrive\Desktop\NB_veh_files' not found."
Lenovo is an odd user name. Well, in any case, clearly you need to provide a path that actually exists and that MATLAB can access (i.e. permitted by the access rights of the account that you are using).
"'/This PC/Desktop/NB_veh_files' not found."
Of course not, "This PC" does not exist on any path, it is simply an attempt by MS to confuse its users.
"P='/Desktop/NB_veh_files'"
might work, if the MATLAB current directory is in the user folder and the files are saved in that subfolder (actually saved, not just links of whatever kind). But you do not say, what is the current directory that you have selected for MATLAB to use.
Do not simply copy from the MS File Explorer address bar, because it will give you a whole lot of nonsense (ask MS if you want to know why). Everything that you see listed under "This PC" and probably "OneDrive" and most things under your user folder do not really exist as folders in your file system, they are just MS registry magic, things that look like folders but are really just made of smoke and mirrors. Sadly MS wants to "abstract" us ways from referring to actual drive locations (because hey, everything is on the cloud, right?)
Go to your C/D/whatever drive. Navigate to the folder you want. Copy that path. Use it.
You could even use MATLAB to do the navigation.

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回答（1 个）

VBBV
VBBV 2023-3-10
编辑：VBBV 2023-3-10
Use small k, in place of K , Matlab is case sensitive
P='C:\Users\Lenovo\OneDrive\Desktop\NB_veh_files';
S=dir(fullfile(P,filesep,'*.csv'));
% check with this too
for k=1:numel(S) % use small k
F=fullfile(P,S(k).name);
S(k).data=readmatrix(F);
end
figure
hold on
for k=1:1388
plot (S(k).data(:,1), S(k).data(:,4),'black','LineWidth',0.1)
end
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VBBV
VBBV 2023-3-10
@Laxmi Bhatta, As @Stephen23 suggested, please also check whether there are any files in that folder location. Also, try using filesep in the below line,
S=dir(fullfile(P,filesep,'*.csv'));
Stephen23
Stephen23 2023-3-10
编辑：Stephen23 2023-3-10
"Also, try using filesep in the below line"
Is not required, for the reason already explained here:
https://www.mathworks.com/matlabcentral/answers/1926110-reference-to-non-existent-field-data#comment_2654280

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