1 files changed, 129 insertions, 0 deletions
diff --git a/HDF5Examples/C/H5T/h5ex_t_float.c b/HDF5Examples/C/H5T/h5ex_t_float.c
new file mode 100644
index 0000000..1295448
--- /dev/null
+++ b/HDF5Examples/C/H5T/h5ex_t_float.c
@@ -0,0 +1,129 @@
+/************************************************************
+
+  This example shows how to read and write float datatypes
+  to a dataset.  The program first writes floats to a
+  dataset with a dataspace of DIM0xDIM1, then closes the
+  file.  Next, it reopens the file, reads back the data, and
+  outputs it to the screen.
+
+ ************************************************************/
+
+#include "hdf5.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+#define FILE    "h5ex_t_float.h5"
+#define DATASET "DS1"
+#define DIM0    4
+#define DIM1    7
+
+int
+main(void)
+{
+    hid_t   file, space, dset; /* Handles */
+    herr_t  status;
+    hsize_t dims[2] = {DIM0, DIM1};
+    double  wdata[DIM0][DIM1], /* Write buffer */
+        **rdata;               /* Read buffer */
+    int     ndims;
+    hsize_t i, j;
+
+    /*
+     * Initialize data.
+     */
+    for (i = 0; i < DIM0; i++)
+        for (j = 0; j < DIM1; j++)
+            wdata[i][j] = (double)i / (j + 0.5) + j;
+
+    /*
+     * Create a new file using the default properties.
+     */
+    file = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+
+    /*
+     * Create dataspace.  Setting maximum size to NULL sets the maximum
+     * size to be the current size.
+     */
+    space = H5Screate_simple(2, dims, NULL);
+
+    /*
+     * Create the dataset and write the floating point data to it.  In
+     * this example we will save the data as 64 bit little endian IEEE
+     * floating point numbers, regardless of the native type.  The HDF5
+     * library automatically converts between different floating point
+     * types.
+     */
+    dset   = H5Dcreate(file, DATASET, H5T_IEEE_F64LE, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    status = H5Dwrite(dset, H5T_NATIVE_DOUBLE, H5S_ALL, H5S_ALL, H5P_DEFAULT, wdata[0]);
+
+    /*
+     * Close and release resources.
+     */
+    status = H5Dclose(dset);
+    status = H5Sclose(space);
+    status = H5Fclose(file);
+
+    /*
+     * Now we begin the read section of this example.  Here we assume
+     * the dataset has the same name and rank, but can have any size.
+     * Therefore we must allocate a new array to read in data using
+     * malloc().
+     */
+
+    /*
+     * Open file and dataset.
+     */
+    file = H5Fopen(FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
+    dset = H5Dopen(file, DATASET, H5P_DEFAULT);
+
+    /*
+     * Get dataspace and allocate memory for read buffer.  This is a
+     * two dimensional dataset so the dynamic allocation must be done
+     * in steps.
+     */
+    space = H5Dget_space(dset);
+    ndims = H5Sget_simple_extent_dims(space, dims, NULL);
+
+    /*
+     * Allocate array of pointers to rows.
+     */
+    rdata = (double **)malloc(dims[0] * sizeof(double *));
+
+    /*
+     * Allocate space for floating point data.
+     */
+    rdata[0] = (double *)malloc(dims[0] * dims[1] * sizeof(double));
+
+    /*
+     * Set the rest of the pointers to rows to the correct addresses.
+     */
+    for (i = 1; i < dims[0]; i++)
+        rdata[i] = rdata[0] + i * dims[1];
+
+    /*
+     * Read the data.
+     */
+    status = H5Dread(dset, H5T_NATIVE_DOUBLE, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata[0]);
+
+    /*
+     * Output the data to the screen.
+     */
+    printf("%s:\n", DATASET);
+    for (i = 0; i < dims[0]; i++) {
+        printf(" [");
+        for (j = 0; j < dims[1]; j++)
+            printf(" %6.4f", rdata[i][j]);
+        printf("]\n");
+    }
+
+    /*
+     * Close and release resources.
+     */
+    free(rdata[0]);
+    free(rdata);
+    status = H5Dclose(dset);
+    status = H5Sclose(space);
+    status = H5Fclose(file);
+
+    return 0;
+}