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

(11/14/19)

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

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