fileDatastore using for loop and scatter

Question

akk 2021-10-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1570398-filedatastore-using-for-loop-and-scatter

回答： Ive J 2021-10-24

Hi,

I am trying to load multiple .csv files from a folder (file1.csv, file2.csv, etc). Then I would like to plot specifc variables from each table onto the same plot. I can only get my code to plot one file though. I am not great with for loops...

fds = fileDatastore('*.csv', 'ReadFcn', @importdata)
fullFileNames = fds.Files
numFiles = length(fullFileNames)
% Loop over all files reading them in and plotting them.
for k = 1 : numFiles
    fprintf('Now reading file %s\n', fullFileNames{k});
T = readtable('file4.csv');
scatter3( -T.Long, T.Lat, T.Depth_Meter_, 30, T.Temperature_Celsius_);hold on;
end

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Answer 1

Ive J 2021-10-24

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1570398-filedatastore-using-for-loop-and-scatter#answer_815118

在 MATLAB Online 中打开

You are not even reading your csv files; you just read the same file file4.csv over and over! Try this:

fds = fileDatastore('*.csv', 'ReadFcn', @readtable);
fullFileNames = fds.Files
numFiles = length(fullFileNames)
% Loop over all files reading them in and plotting them.
figure; hold on
for k = 1:numel(fds.Files)
    fprintf('Now reading file %s\n', fds.Files{k});
    T = read(fds);
    scatter3( -T.Long, T.Lat, T.Depth_Meter_, 30, T.Temperature_Celsius_);
end
hold off