How do I plot a 3D mesh from multiple csv files?
显示 更早的评论
How do I plot a 3D mesh from multiple csv files?
Here is the code I've been using, found from the internet:
nFiles=101
filenamePrefix='F1--Trace-no loop-0000--0000';
filenameExtension='.csv';
for i = 1:nFiles
filename = [filenamePrefix, int2str(i), filenameExtension];
tmpData=load(filename,'-ascii');
x{i}=tmpData(:,1);
y{i}=tmpData(:,2);
end
mesh(x{i},y{i},i}
This is the error I recieved:
Error using load
Number of columns on line 2 of ASCII file F1--Trace-no
loop-0000--00001.csv must be the same as previous lines.
采纳的回答
The problem apparently is with loading the files, nothing to do with plotting 3d mesh, or at least it didn't get far enough to have any problem with that. It is difficulat to tell exactly what is causing the problem without seeing the files you are trying to load.
I think that it is likely that the first line is a header and has a different number of columns
You could try
tmpData = readmatrix(filename, 'NumHeaderLines',1)
11 个评论
Simon Mendum
2019-8-13
Jon
2019-8-13
On what line of your code does this occur. Please cut and paste the entire error message.
Also, the line in your code above
mesh(x{i},y{i},i}
will definitely throw an error as curly bracket on the right does not match up with anything.
I don't know why you are assigning the values using curly braces. This makes cell arrays. You don't need those as inputs to mesh.
In general, I do not understand your code.
If you are going to plot a wireframe mesh for the data in each .csv file then the call to mesh should be inside of your loop.
Also is the "z" value of your mesh really given by the file count. That doesn't make sense to me.
I suggest cleaning up the structure of your code so that it does what you want, and then see what remaining syntax and other errors you have.
Simon Mendum
2019-8-13
Jon
2019-8-13
Please attach one of your data files. Maybe if I look at this I can better understand what you are doing
Simon Mendum
2019-8-13
I think something like this should be close to what you want.
Note, you have to be careful generating the number part of the filename so that it includes leading zeros. I have assumed that you have the same number of data points (421) in all of the files and hard coded that, but you could be more general if needed.
nFiles=101
filenamePrefix='F1--Trace-no loop-0000--';
filenameExtension='.csv';
% preallocate arrays to hold data
A = zeros(421,nFiles);
Hz = zeros(421,nFiles)
T = zeros(421,nFiles)
% loop through the data files assigning data
for i = 1:nFiles
filestr = num2str(i-1,'%05.f')% % include leading zeros e.g. '00001', '00099'
filename = [filenamePrefix, filestr, filenameExtension];
tmpData = readmatrix(filename, 'NumHeaderLines',1)
T(:,i) =tmpData(:,1); % time
Hz(:,i) = i*1000; % assume 1KHz steps
A(:,i) = tmpData(:,2); % amplitude
end
% plot the results
mesh(Hz,T,A)
xlabel('Hz')
ylabel('time')
zlabel('amplitude')
Simon Mendum
2019-8-13
I would guess this means that some of your files have more samples (time,amplitude) pairs than others. Try making these changes
numPoints = 450; % or what ever you think the maximum will be
% preallocate arrays to hold data
% data files may have different number of points
% allocate for the maximum and
% fill with NaN so unused points will not be plotted
A = NaN(numPoints,nFiles);
Hz = NaN(numPoints,nFiles)
T = NaN(numPoints,nFiles)
Simon Mendum
2019-8-13
Jon
2019-8-13
Thanks!
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Spreadsheets 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
