This holds true for both pure-HDF files (saved via the hdf and hdf5 set of functions, for HDF4 and HDF5 formats respectively), and v7.3-format MAT files. For this reason, HDF5 files are typically larger and slower than non-HDF5 MAT files, especially if the data contains cell arrays or structs. Moreover, Matlab’s HDF5 implementation does not by default compress non-numeric data (struct and cell arrays). HDF5 uses a generic format to store data of any conceivable type, and has a non-significant storage overhead in order to describe the file’s contents. The following table summarizes the available options for saving data using the save function: save option Note that Matlab’s 7.3 format is not a pure HDF5 file, but rather a HDF5 variant that uses an undocumented internal format. Matlab 6 and earlier did not employ automatic data compression Matlab versions 7.0 (R14) through 7.2 (R2006a) use GZIP compression Matlab 7.3 (R2006b) and newer can use an HDF5-variant format, which apparently also uses GZIP (level-3) compression, although MathWorks might have done better to pay the license cost of employing SZIP ( thanks to Malcolm Lidierth for the clarification). This format is publicly available and adaptors are available for other programming languages ( C, C#, Java). MAT is Matlab’s default data format for the save function. Today’s article will show little-known tricks of improving save‘s performance. This data can later be loaded back into Matlab using the load function. Matlab’s built-in save function is an easy and very convenient way to store data in both binary and text formats. But we often don’t need or want to use such low-level functions. fwrite is normally used to store binary data in some custom pre-defined format. If you want to save the contents to a new file, you can specify a new name.Two weeks ago I posted an article about improving fwrite‘s performance. Note that the diary command will append the data to the previous data if it’s present, which means the size of the file will increase, so it’s a better practice to close the diary when you are finished. > diary('fileName.txt')Īs you can see the contents of the command window are saved inside a text file. For example, let’s save some command window contents to a text file. To save the contents, first, you need to create a diary at the start of your MATLAB session using the diary command, and when you are done with your session, you have to turn the diary off using the diary off command. The diary command saves the contents of the command window in a specified file if no file is specified, a file name diary will be used. To save the contents of the command window in MATLAB, you can use the diary command. Save Command Window Contents Using the diary Command in MATLAB This tutorial will discuss how to save the command window contents using the diary command in MATLAB.
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