| Item |
Description | Type |
Size |
| 1 |
Magic number. A value to identify the file type.
The value is set to "barr\r\n\032\n”. |
char | 8 bytes |
| 2 | The version
number of the file. The version number is either 1.0 or 2.0. |
float |
4 bytes |
| 3 | Number of
sequences stored in the file. This will be referred to as NSEQ. |
integer |
4 bytes |
| 4 | Number of
columns per data point. This will be referred to as NCOL. |
integer |
4 bytes |
| 5 | The field
types, one per column of data. The possible values are:
0 – Double
1 – Float
2 – 4 byte signed integer
3 – 2 byte signed integer
4 – 1 byte signed integer
5 – 4 byte unsigned integer
6 – 2 byte unsigned integer
7 – 1 byte unsigned integer
Currently only types 1 and 2 are used in Affymetrix BAR files. |
integer |
4*NCOL |
| 6 | The number of
parameter name/value pairs. The parameter names and values are stored as
strings. Note: Items 7-10 are repeated for each parameter. |
integer |
4 bytes |
| 7 | The length of
the parameter name. | integer |
4 bytes |
| 8 | The parameter
name. | char |
Specified by item #7. |
| 9 | The length of
the parameter value. | integer |
4 bytes |
| 10 | The
parameter value. | char |
Specified by item #9. |
| Item |
Description | Type |
Size |
| 1 |
The length of the sequence name. Refered to as
SEQNAMELEN. |
integer | 4
bytes |
| 2 |
The sequence name. |
char | Specified
by item #1 |
| 3 | The length of
the sequence group name. (only for version 2.0 and above files). |
integer | 4 bytes |
| 4 | The name of
the group which the sequence is a member (for example, often specifies
organism). (only for version 2.0 and above files). |
char |
Specified by item #3 |
| 5 | The length of
the sequence version. | integer |
4 bytes |
| 6 | The sequence
version. | char |
Specified by item #5 |
| 7 | The number of
parameter name/value pairs. (only for version 2.0 and above files).
Note: Items 8-11 are repeated for each parameter. |
integer |
4 bytes |
| 8 | The length of
the parameter name. (only for version 2.0 and above files). |
integer |
4 bytes |
| 9 | The name of
the parameter. (only for version 2.0 and above files). |
char |
Specified by item #8 |
| 10 | The length
of the parameter value. (only for version 2.0 and above files). |
integer |
4 bytes |
| 11 | The value of
the parameter. (only for version 2.0 and above files). |
char |
Specified by item #10 |
| 12 | The number
of data points defined in the sequence. Each data point will contain NCOL
column values. | integer |
4 bytes |
| 13 | The next set
of values in the file is the data points for the sequence. Each data point
contains NCOL column values. The type, thus the size, of each column is
defined above in the field types section. |
see description. |
see description. |
