putvec

int putvec(WFDB_Sample *vector)

Return:

>0

Success: the returned value is the number of output signals (the number of entries in vector that were written)

0

Slew rate too high for one or more signals (difference format only; the DC level(s) will be corrected as soon as the slew rate permits)

-1

Failure: write error

This function writes a sample to each input signal. The caller should fill an array of WFDB_Samples with the samples and pass a pointer to this array to putvec. (The length of the array must be no less than the number of output signals, as given to osigfopen or osigopen.) On entry, vector[i] contains the next sample from signal i. For example, this modified version of the previous example (see section getvec) copies the first ten samples of each available input signal:

#include <stdio.h> #include <wfdb/wfdb.h> main() { int i, j, nsig; WFDB_Sample *v; WFDB_Siginfo *s; nsig = isigopen("100s", NULL, 0); if (nsig < 1) exit(1); s = (WFDB_Siginfo *)malloc(nsig * sizeof(WFDB_Siginfo)); if (isigopen("100s", s, nsig) != nsig || osigopen("8l", s, nsig) != nsig) exit(1); v = (WFDB_Sample *)malloc(nsig * sizeof(WFDB_Sample)); for (i = 0; i < 10; i++) if (getvec(v) < 0 || putvec(v) < 0) break; wfdbquit(); exit(0); }

(See http://www.physionet.org/physiotools/wfdb/examples/exputvec.c for a copy of this program.)

All programs that write signals or annotations must invoke wfdbquit to close the output files properly (see section wfdbquit). This example uses record `8l' (see section 5.8 Piped and Local Records) for the output signal specifications; the output signal files will be named `data0' and `data1' in the current directory. Several of the example programs in chapter 6 illustrate the use of putvec; for example, see section Example 6: A Differentiator.