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# slow5_hdr_set
## NAME
slow5_hdr_set - sets a header data attribute for a particular read_group
## SYNOPSYS
`int slow5_hdr_set(const char *attr, const char *value, uint32_t read_group, slow5_hdr_t *header)`
## DESCRIPTION
`slow5_hdr_set()` sets the attribute value *value* for specified attribute name *attr* of a specified read group *read_group* in a SLOW5 file header pointed by *header*.
The argument *header* points to a SLOW5 header of type *slow5_hdr_t* and typically this is the *s5p->header* member inside the *slow5_file_t \*s5p* returned by `slow5_open()`.
## RETURN VALUE
Upon successful completion, `slow5_hdr_set()` returns a non negative integer (>=0). Otherwise, a negative value is returned that indicates the error.
## ERRORS
A negative value is returned when an error occurs and can be due to following occasions (not an exhaustive list):
- attribute name doesn't exist
- read group is out of range
- an input parameter is NULL
## NOTES
In the future `slow5_errno` will be set to indicate the error.
## EXAMPLES
```
#include <stdio.h>
#include <stdlib.h>
#include <slow5/slow5.h>
#define FILE_PATH "test.slow5"
int main(){
slow5_file_t *sp = slow5_open(FILE_PATH, "w");
if(sp==NULL){
fprintf(stderr,"Error opening file!\n");
exit(EXIT_FAILURE);
}
slow5_hdr_t* header = sp->header;
//add a header group attribute called run_id
if (slow5_hdr_add("run_id", header) != 0){
fprintf(stderr,"Error adding run_id attribute\n");
exit(EXIT_FAILURE);
}
//set the run_id attribute to "run_0" for read group 0
if (slow5_hdr_set("run_id", "run_0", 0, header) != 0){
fprintf(stderr,"Error setting run_id attribute in read group 0\n");
exit(EXIT_FAILURE);
}
//....
}
```
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