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AR
ARITHMETIC is a module which performs image arithmetic. It accepts
as input an arithmetic expression, parses it and applies it to a set
of input maps, leaving the result in a set of output maps. Because of the
considerable power of the program, scope exists for the user to corrupt or
delete data. Please exercise care in using this option; check your
expressions before pressing <CR>.
The program prompts the user to enter the arithmetic expression:
Enter expression to be evaluated
Expression=
A <CR> at this stage will cause ARITHMETIC to return to the main program.
A simple example of this routine is given below. Occasionaly, it will be
more convenient to use option AT or one of the other more specialized
arithmetic options when looping is desired.
The operation below converts magnitudes to relative intensities.
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Enter an option: 26-SEP-1981 17:51:29.09
OPTION=AR
Enter the expression to be evaluated:
Expression=EXCUT<1>=0-0.4*EXCUT<1>
....The 0 is necessary to negate the values
The file EXCUT is used in the expression
There are 2 maps in the file
Reading from the file
11 rows of 2035 pixels in R4 format
Opening file EXCUT for output
Writing to an existing file
11 rows of 2035 pixels in R4 format
Do you wish to evaluate another expression? (default = N)
MORE=Y
Enter the expression to be evaluated:
Expression=EXCUT<1>=10**EXCUT<1>
....Antilog
The file EXCUT is used in the expression
There are 2 maps in the file
Reading from the file
11 rows of 2035 pixels in R4 format
Opening file EXCUT for output
Writing to an existing file
11 rows of 2035 pixels in R4 format
Do you wish to evaluate another expression? (default = N)
MORE=
F
Enter an option: 26-SEP-1981 17:52:19.09
OPTION=
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