Open selected csv file and plot

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noname 2018-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/388268-open-selected-csv-file-and-plot

评论： noname 2018-3-24

Hi everyone, I have excel file with many spreadsheets; I convert them into csv file. My problem I have now is I want to open the csv file using uigetfile, and plot that file. However, I don't know how to plot it since different file has different data size. Can anyone help me with that? Thanks alot.

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noname 2018-3-24

I'd like to use the multiselect to open more than one file, then plot them, but I don't know how to approach it. I'd really appreciate if anyone could help me. Thanks alot!

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采纳的回答

Image Analyst 2018-3-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/388268-open-selected-csv-file-and-plot#answer_310018

在 MATLAB Online 中打开

Try this:

% Have user browse for a file, from a specified "starting folder."
% For convenience in browsing, set a starting folder from which to browse.
startingFolder = pwd;  % or 'C:\wherever';
if ~exist(startingFolder, 'dir')
  % If that folder doesn't exist, just start in the current folder.
  startingFolder = pwd;
end
% Get the name of the file that the user wants to use.
defaultFileName = fullfile(startingFolder, '*.*');
[baseFileName, folder] = uigetfile(defaultFileName, 'Select a file');
if baseFileName == 0
  % User clicked the Cancel button.
  return;
end
fullFileName = fullfile(folder, baseFileName)
data = csvread(fullFileName);
x = data(:, 1); % Or wherever
y = data(:, 2);
plot(x, y, 'b*-', 'LineWidth', 2);
grid on;
title('Y vs. X', 'FontSize', 20);
xlabel('X', 'FontSize', 20);
ylabel('Y', 'FontSize', 20);

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per isakson 2018-3-16

编辑：per isakson 2018-3-16

在 MATLAB Online 中打开

>> m=dlmread( 'Book3.csv', ',', 1,0);

works fine, but

>> m=dlmread( 'Book3.csv', ',', 0,0);
Error using dlmread (line 147)
Mismatch between file and format string.
Trouble reading 'Numeric' field from file (row number 1, field number 1) ==>
numberone,numbertwo,numberthree,numberfour\n