FI N - File Information - List and retrieve, No halt if file not found

PURPOSE

Prints out information on specified SPIDER or MRC file. Unlike operation 'FI' there is no error if the file does not exist.   Example.

SEE ALSO

FI	[File Information - List and retrieve file header value(s) by location]
FI A	[File Information - Multiple files]
FI X	[File Information - Retrieve file header value(s) by location]
FI H	[File Information - Retrieve file Header values by name]

USAGE

.OPERATION: FI N [maxi],[average]

[This operation can return a variable number of optional register variables On completion of the operation, the variable(s) receive the values in header locations specified. Always prints out: Minimum, Maximum, Average, Standard deviation, Phi, Theta, Psi, X offset, Y offset, and Z offset header values from the file in the results file.]

.INPUT FILE: PIC002
[SPIDER or MRC file name.]

If register variables are present on the operation line SPIDER asks:

.NUMBER(S) OF HEADER LOCATION(S) TO BE RETRIEVED: 7, 9

[Here, label location No. 7 (which is FMAX in SPIDER files) is placed in register variable: [maxi] and No. 9 (which is AV in SPIDER files) is placed in register variable: [average].]

NOTES

1. If the statistical variables (i.e. FMIN, FMAX, AV, & SIG are not already present in the header of the file then they are not calculated. Only values already in the header are listed. Use: 'FS' to set these values in the header.

2. SPIDER file header locations.

3. MRC file header locations.

SUBROUTINES

FILGEN, FILDAT

CALLER

UTIL1