cdfsamplingfromdata.c
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/* $Id: timeResFromData.c,v 1.1 2010/08/31 10:32:55 budnik Exp $ */
/** @file timeResFromData.c
* @brief Function to get CDAWEB dataset sampling times from data files
*/
#include <stdio.h>
#include <stdlib.h>
#include <cdf.h>
#include <string.h>
#include <time.h>
#include <math.h>
#define fileName "temp.cdf"
#define badFile -100
/*************************************
Global variables and structures
**************************************/
long CDFDims, // Number of dimensions in a CDF file
CDFVars, // Number of variables in a CDF file
CDFDimSizes[CDF_MAX_DIMS], // Dimension Sizes in a CDF file
CDFencoding, // Data encoding
CDFmajority, // Variable majority
CDFmaxRec, // max Record number
CDFAttrs; // number of CDF Attributes
// CDFdatatype;
struct cdfvar { // CDF variable structure
char name[CDF_VAR_NAME_LEN+1];
long num; //variable number
long datatype;
long numElem; // variable dimensionality
long recVariance; // variable rec Variance
long dimVariances[CDF_MAX_DIMS]; // # of data values in dimSizes
} cdfVar;
/*--------------------------------------------------------------------------
* Handles a CDF error.
*--------------------------------------------------------------------------*/
void cdf_handle_error(CDFstatus status)
{
char message[CDF_STATUSTEXT_LEN+1];
CDFerror (status, message); /* Get the appropriate message */
fprintf (stderr, "%s\n", message);
exit(1);
}
void find_min(int* delta, int nRecs, int minFalse, int* minVal)
{
int i, n, min;
n = 1;
i = 0;
while (abs(delta[i]) <= minFalse) i++;
if (i < nRecs) {
min = abs(delta[i]);
// printf(" first MIN %d \n", min);
for (i = 1; i < nRecs; i++) {
// printf(" delta %d \n", delta[i]);
if (delta[i] == min) n++;
if (delta[i] < min && delta[i] > minFalse) {
min = delta[i];
n = 1;
}
}
} else { min = -10;
n = nRecs;
}
minVal[0] = min;
minVal[1] = n;
printf(" MIN %d %d\n", min, n);
}
int main(int argc, char *argv[])
{
long RecStart = 0, RecCount, RecInt = 1;
long indices[1] = {0}, intervals[1] = {1}, counts[1] = {1};
long varN = -1;
long datatype = 0, attrN, maxEntry;
CDFstatus cstatus; // CDF status code
CDFid id;
double *value;
int *delta;
int i, minFalse = 0, numEnough;
int min[2] = {0, 0};
char attrValue[300];
float Sampling;
double epoch16[2];
long year, month, day, hour, minute, sec, msec, mksec, nsec, psec;
/*********************** Open CDF file *****************************/
if ((cstatus = CDFopen(fileName, &id)) != CDF_OK)
cdf_handle_error(cstatus);
/*********** treat all vars as zVars with eliminated false dimensionality and get Nrecs **********/
if ((cstatus = CDFlib(SELECT_, CDF_zMODE_, zMODEon2, NULL_)) != CDF_OK)
cdf_handle_error (cstatus);
while (datatype != CDF_EPOCH && datatype != CDF_EPOCH16){
varN++;
if ((cstatus = CDFlib(SELECT_, zVAR_, varN,
GET_, zVAR_DATATYPE_, &datatype, NULL_)) != CDF_OK)
cdf_handle_error (cstatus);
// if (datatype == CDF_EPOCH16) break;
}
fprintf(stdout,"DATATYPE %d %d\n", varN, datatype);
if ((cstatus = CDFlib(SELECT_, zVAR_, varN,
GET_, zVAR_MAXREC_, &CDFmaxRec, NULL_)) != CDF_OK)
cdf_handle_error (cstatus);
fprintf(stdout,"Max Recs %d\n", CDFmaxRec+1);
if (CDFmaxRec < 10) {
fprintf(stdout," %d\n", badFile);
exit (0);
}
value = (double *)malloc(sizeof(double)* (CDFmaxRec+1)*((datatype == CDF_EPOCH16)+1));
/******************* Get Epoch *************************/
if ((cstatus = CDFlib (SELECT_,
zVAR_, varN,
zVAR_RECNUMBER_, RecStart,
zVAR_RECCOUNT_, CDFmaxRec+1,
zVAR_RECINTERVAL_, RecInt,
zVAR_DIMINDICES_, indices,
zVAR_DIMCOUNTS_, counts,
zVAR_DIMINTERVALS_, intervals,
GET_, zVAR_HYPERDATA_, value, NULL_)) != CDF_OK)
cdf_handle_error (cstatus);
delta = (int *)malloc(sizeof(int)* CDFmaxRec);
for (i = 1; i < CDFmaxRec+1; i++)
{
if (datatype == CDF_EPOCH16) {
epoch16[0] = value[2*(i-1)];
epoch16[1] = value[2*(i-1)+1];
EPOCH16breakdown(epoch16, &year, &month, &day, &hour, &minute, &sec, &msec, &mksec, &nsec, &psec);
value[i-1] = computeEPOCH(year, month, day, hour, minute, sec, msec);
epoch16[0] = value[2*i];
epoch16[1] = value[2*i+1];
EPOCH16breakdown(epoch16, &year, &month, &day, &hour, &minute, &sec, &msec, &mksec, &nsec, &psec);
value[i] = computeEPOCH(year, month, day, hour, minute, sec, msec);
}
delta[i-1] = (int)(value[i] - value[i-1] + 50)/100;
}
// fprintf(stdout,"value %f\n", value[11]-value[10]);
free(value);
// fprintf(stdout,"delta %d\n", delta[0]);
numEnough = CDFmaxRec/10;
while (min[1] < numEnough) {
fprintf(stdout,"minFalse %d\n", minFalse);
find_min(delta, CDFmaxRec, minFalse, min);
minFalse = min[0];
}
free(delta);
if ((cstatus = CDFlib(CLOSE_, CDF_, NULL_)) != CDF_OK)
cdf_handle_error (cstatus);
// fprintf(stdout,"%d %f\n",min[1], (float)min[0]/100.0);
fprintf(stdout,"%f\n",(float)min[0]/10.0);
}