Calculator Operations Window

Introduction

This window allows the X and Y values of a spectrum to be transformed by simple calculator operations.

Description

The window consists of three TEXT AREAS and three BUTTONS. The text areas specify the spectrum to be operated on, the x transformation and the y transformation. The Operate button carries out the operation. Cancel removes the window and Help displays this help.

Operation

Specify the spectrum number ( or numbers ) in the first text area, OperateDialog.helpeither by typing them in or by selecting them from the list of spectra. Transformations aOperateDialog.helpre specified in a fairly simplistic way by using symbols:

* multiply
/ divide
+ add
- subtract

Parantheses may be used to bracket expressions. In addition these functions are available:

sin(x) sine of x
cos(x) cosine of x
atan(x) arc tangent of x
exp(x) e to the power x
ln(x) natural logarithm of x

and these constant values:

PI 3.141593
E 2.718282
DEG 57.295780
AU 0.529177

The symbols 'X' and 'Y' are used to specify the current x and y value.

Examples

X values to become: x * 2.0
Y values to become: y + sin(x)
X values to become: ( 3.0 * PI ) / ( OperateDialog.helpln(x) )
Y values to become: sin(y) + x

Warning

The mechanism used by the calculator operations can be extremely slow. Do not use it for operations which are available on other menus. If you want to process large spectra it is probably worth writing your own programs and using the 'UserDefined' operations window. See the help on that window for more information.