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Trying to get time between each start and stop & total time per day from a text file.
I would go with unstack: >> T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/702232/FDATA.TXT'); ...

4年以上前 | 0

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How to vertically join differently sized tables?
One way is to "assign off the end": >> table1 = table(1,70,175,29,datetime(1992,7,1),"M",'VariableNames',{'Num','Weight','Heigh...

4年以上前 | 1

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Connect correct temperature to another table based on time
Use timetables. It's a one-liner: >> A = timetable(datetime(["13-aug-2020";"14-aug-2020";"15-aug-2020"]), [13.8; 12.2; 8.5]) ...

4年以上前 | 1

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bar graph with non numerical x-axis
Simon's solution is one way to do it. But using categorical just to label the bars is kind of an abuse of categorical, which is ...

4年以上前 | 1

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How to treat a duration array in a for loop?
Judith, I can't really follow what you are doing, but if you have timestamped data, you should be using a timetable, and then re...

4年以上前 | 1

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Reorganize table and make groups of rows to columns
You need unstack: >> Date = datetime(1963,[1;2;3;1;2;3;1;2;3],[31;28;29;31;28;29;31;28;29]); >> Permno = [10065;10065;10065;10...

4年以上前 | 2

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Delete rows in cell aray where there is anything in one collum.
A cell array is the wrong way to store these data. You want a table, or probably a timetable. The fact that you say, "the name o...

4年以上前 | 0

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Prevent overwriting within a for loop in 3D-motion tracking
You may just want T = table(); for ... ... T = [T; readtable (thisFile)];

4年以上前 | 0

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How to convert the number of seconds from an epoch into UTC using the datetime function.
Matthew, this is easier than you think. In MATLAB, 'TimeZone','UTC' is sort of a ficticious timeline that pretends that leaps se...

4年以上前 | 2

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How to plot only the matches of two different datetime?
If all you have are two datetime vectors, you can use intersect to find the common values. But I'm guessing you have other data ...

4年以上前 | 0

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How to filter the data.
Not sure how you are getting those data into MATLAB, but I suggest that you figure out why you have a cell array. You want a tab...

4年以上前 | 0

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extracting columns from multiple cell arrays consist of table data
If you've read two "similar" tables into a 2x1 cell array, best ting to do is to vertvat them outside the loop: >> C = {array2t...

4年以上前 | 1

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split cell in 2 columns
Use cellfun, two possibilities: function [val1,val2] = myfun1(x) val1 = x(1); if isscalar(x) val2 = 0; else val2 =...

4年以上前 | 0

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How do I find the corresponding date/time value of the maximum of my data in a table?
This is a pretty common question, so I'm gonna show a bunch of stuff in hopes others can find it useful. Let's start with a sim...

4年以上前 | 0

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how to sort a cell array inside a struct?
I think you would be better off with a table than a struct. Name_Code = table(IDs, C,'VariableNames',["Name" "Codes"]) Name_Co...

4年以上前 | 0

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Error with splitting table into separate columns.
This is an application of unstack and then stack. The code looks a lot more complicated than it might if I hard-coded in sizes, ...

4年以上前 | 0

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Coordinate interpolation with time
This line of code pf = polyfit(Lat(:,1) Lat(:,2)], [(Long(:,1) Long(:,2)] %Coordinates is not valid syntax for several reasons...

4年以上前 | 0

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Smartly search between tables
This would be trivial if varfun accepted more than one table input, but it doesn't do that. But you can make one table that look...

4年以上前 | 0

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Calculete monthly anomalies time series temperature
You are not doing yourself any favors by using raw numeric vectors with no timestamps. This is almost trivial using datetime and...

4年以上前 | 1

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repeating step signal in real time with a hold value of 5 seconds
Like this? >> interp1([1 5 6 10 11 15],[1 1 2 2 3 3],1:15,"prev") ans = 1 1 1 1 1 2 2 2 2 ...

4年以上前 | 0

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how to expand the date matrix?
roudan, this question doesn't seem to make any sense. For one thing, it doesn't seem useful that you have a column whose header ...

4年以上前 | 1

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Program architecture for handling large .csv files
With no code at all to go on, it's pretty hard to give specific advice. Hex issues aside, the first advice I would give would b...

4年以上前 | 1

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Transforming data table from wide to long format
stack to the rescue, twice, because you are stacking two pairs of variables all into one variable: >> tw = readtable("wide_form...

4年以上前 | 1

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Trying to use retime to sum daily values, but I don't want days that only have NaN values to become 0
In the doc for retime (admittedly, not really in flashing bold letters): "All the listed methods omit NaNs, NaTs, and other miss...

4年以上前 | 0

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Split a target date interval into seasons and find the percentile of days for each season
Another possibility: >> yr = 2020; >> edges = datetime(yr,[1 3 6 9 12,12],[1 1 1 1 1 32]) edges = 1×6 datetime array ...

4年以上前 | 1

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hours(diff(datetime([t1;t2]))) function
In addition to what others have said, you probably don't need the "hours" in hours(diff(datetime(t1;t2]))) All that does is tu...

4年以上前 | 0

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Unable to perform assignment because the left and right sides have a different number of elements.
No idea what filename = 'Format_competition.xlsx'; has to do with this, so I suspect you have not told us the whole story. In...

4年以上前 | 0

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Plot time series analysis from multiple netcdf files
Mir, I'm not very familiar with MATLAB's netCDF features, but there are ways to read the files and you should read the doc about...

4年以上前 | 0

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Convert Number to Time / Duration Format of Data Column
This is much simpler than you think. You can't currently parse things like "000002" directly into duration, but you can get ther...

4年以上前 | 0

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Perform a calculation using data from multiple tables
Mark, have you tried using join? t = readtable("flight data.xlsx","TextType","string") t = join(t,T_Distance,"LeftKey","Destin...

4年以上前 | 0

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