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# slow5_idx_unload
## NAME
slow5_idx_unload - unloads a SLOW5 index from the memory
## SYNOPSYS
`void slow5_idx_unload(slow5_file_t *s5p)`
## DESCRIPTION
`slow5_idx_unload()` unloads an index file loaded into memory for a SLOW5 file pointed by *s5p*, which must have been previously loaded using `slow5_idx_load()`. Otherwise, or if *slow5_idx_unload(s5p)* has already been called before, undefined behaviour occurs.
## RETURN VALUE
No return value
## NOTES
## EXAMPLES
```
#include <stdio.h>
#include <stdlib.h>
#include <slow5/slow5.h>
#define FILE_PATH "examples/example.slow5"
int main(){
slow5_file_t *sp = slow5_open(FILE_PATH,"r");
if(sp==NULL){
fprintf(stderr,"Error in opening file\n");
exit(EXIT_FAILURE);
}
int ret=0;
ret = slow5_idx_load(sp);
if(ret<0){
fprintf(stderr,"Error in loading index\n");
exit(EXIT_FAILURE);
}
//...
slow5_idx_unload(sp);
slow5_close(sp);
}
```
## SEE ALSO
[slow5_idx_create()](slow5_idx_create.md), [slow5_idx_load()](slow5_idx_load.md)
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