Map and Table Calculation

Predefined values

In ILWIS the following internal constants are defined:

 

PI

Value p:

3.141592653589793...

PI2

Value 2p:

6.283185307179586...

PIDIV2

Value ½p:

1.570796326794896...

PIDIV4

Value ¼p:

0.785398163397448...

EXP(1)

Value e:

2.718281828459045...

TRUE

1

FALSE

0

Note:

The predefined p values are often applied in combination with trigonometric functions like SIN, ACOS, ATAN2, etc.

Usable in

MapCalc, TabCalc, Simple calculators

Examples

Pocket line calculator examples:

? COS(PI)

returns -1.000

? TAN(PIDIV4)

returns 1

? RADDEG(ATAN2(PI,PI))

returns 45.00

? TRUE*8

returns 8

MapCalc example:

OutMap = InMap + SIN(PIDIV2)

 

InMap

OutMap

2.0 1.0 0.5
0.2 0.3 -1.0
? -0.4 -0.1
3.0 2.0 1.5
1.2 1.3 0.0
? 0.6 0.9

TabCalc example:

OutCol = InCol + COS(PI2)

 

InCol

OutCol

2.0

3.0

1.0

2.0

0.5

1.5

0.2

1.2

0.3

1.3

-1.0

0.0

?

?

-0.4

0.6

-0.1

0.9