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Text version of the page
| Hierarchical Doto Formot ]HDF4) Flit | ||||||||||||||||
| Step 3: Writing MAT LAB Data to an HDF4 File. After creating an HDF4 file and creating a data set in the file, you can write data to the entire data set or just a portion of the data set. In the HDF4 SD API, you use the SDwritedata routine. In MATLAB, use the hdf sd function, specifying as arguments: • Name of the SD API routine, 1 writedata1 in this case • Valid HDF4 SU data set identifier, sds_id, returned by SDcreate " Location in the data set where you want to start writing data, called the Start vector in HDF4 terminology " Number of elements along each dimension to skip between each write Operation, called the stride vector in HDF4 terminology • Total number of elements to write a Ions 'KK.h dimension, called the edges vector in HDF4 terminology • MATLAB array to be written | ||||||||||||||||
| Note You must specify the values of the start, stride, and edges arguments in row-major order, rather than the column-major order used in MATLAB. Note how the example uses f liplr to reverse the order of the dimensions in the vector returned by the size function before assigning it as the value of the edges argument. | ||||||||||||||||
| The values you assign to these arguments depend on the MATLAB array you want to export. For example, the following code fragment writes this MATLAB 3-by-5 array of doubles, A=[ 1234 5; 678910; 11 12 13 14 15 ]; | ||||||||||||||||
| into an HDF4 file: | ||||||||||||||||
| ds_start = zeros(1 :ndims(A||; dsstride = []; ds_edges = fliplr(size(A>); | % Start at the beginning % Write every element. % Reverse the dimensions. | |||||||||||||||
| stat = hdfsd('writedata',sds_id,... | ||||||||||||||||
| 7-G7 | ||||||||||||||||