How many rows matlab

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Other MathWorks country sites are not optimized for visits from your location. Toggle Main Navigation. Search Answers Clear Filters. Answers Support MathWorks. Search Support Clear Filters. Support Answers MathWorks. Search MathWorks. MathWorks Answers Support. You need to better define your question. What does handling mean? Does that only include the creation of the array? Does that include acceptable performance when applying operations?

If so, what is acceptable performance and what operations? For your specific computer, you can test it yourself. I have posted the answer by myself above.

Post it as an answer. Accepted Answer. Walter Roberson on 28 Jul More Answers 1. Steven Lord on 29 Jul The theoretical limit is the number returned as the second output of the computer function. The practical limit is based on how much memory you have on your system, as it's highly unlikely you have a machine capable of creating a matrix large enough to approach the theoretical limit unless it's a sparse tall but thin matrix. Error using sparse. Index into matrix is too large.

Walter Roberson on 29 Jul The sparse x I created has exactly maxsize rows. If you tried to create an array with an extremely large number of dimensions then yes, you'd consume a lot of memory with the size vector. Cancel Copy to Clipboard. You probably want to use either the unique function or logical indexing, can you upload some data to work with?

Answers 3. Sean de Wolski on 14 Jun Vote 1. Edited: Sean de Wolski on 14 Jun Sam Cook on 14 Jun This will vary depending on exactly what time periods you're interested in hourly, daily, etc. Here the time period is every 2 hours from June 13 to June Then, for each interval, you want to count the number of rows that are within that interval.

Again, this code will vary based on how your data is formatted. In this example, 'data' is a datetime vector. These counts refer to their respective interval EG counts 1 is the number of entries from times 1 to times 2 , counts 5 from times 5 to times 6 , etc.

Peter Perkins on 5 Jul Walter Roberson on 14 Jun See Also. Tags table time analysis. Start Hunting!