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Creating a Chart
2.2.2.3 Axis Expressions
The Thermal Desktop Axis Expressions dialog provides the ability to apply an expression to the data for the X and primary Y plot axes. These expressions will be applied before the data is sent to the plotter. The Axis Expression form
shown below contains the selection table in the lower portion of the form and the tools to set expressions in the upper
portion. This dialog is distinct from the units dialog but can be used as an alternative method for applying unit conversions.
Axis Expressions
Selection Table
Axis expressions may use the operators ( ) * + - / as well as ^ or ** for powers. They may access the functions: sin,
cos, tan, asin, acos, atan, ln, log, exp, sqrt, abs, ciel and floor. They may also reference the following built-in conversion
constants:
btuhrwat
cmtoin
dtor
ft3tom3
fttom
gasr
gasrsi
grav
gravsi
inhgtoat
intocm
2-22
= BTU/hr to watts = 2.930722e-1
= cm to inches = 0.3937007874
= degrees to radians = 0.017453292519943
= ft3 to m3 = 2.831685e-02
= ft to meter = 0.3048
= gas const in eng = 1545.0
= gas const in si = 8314.23
= gravity in eng = 416955600.0
= gravity in si = 9.80621
= inches of Hg to atmospheres = 3.342e-2
= inch to cm = 2.54
EZXY User’s Manual, C&R Technologies, Inc.