Built-In Constants and Variables
Math Constants
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Constant
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Keystroke
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Name
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Value
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∞
|
Ctrl+Shift+Z
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Infinity
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e
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e
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Logarithm base
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π
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p, Ctrl+G
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Pi
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Other Constants
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Constant
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Keystroke
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Name
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Value
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i or j
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1i or 1j
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The imaginary units
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Square root of –1
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NaN
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NaN
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Not a Number
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Physics Constants
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Constant
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Keystroke
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Name
|
Value
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c
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Speed of light in vacuum
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ec
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Elementary charge
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h
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Planck's constant
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|
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Reduced Planck's constant (h/2π)
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k
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Boltzmann constant
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mu
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Atomic mass unit
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NA
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Avogadro's number
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R
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Molar gas constant
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R∞
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Rydberg constant
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α
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a, Ctrl+G
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Fine structure constant
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|
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γ
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g, Ctrl+G
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Euler-Mascheroni's constant
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|
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ε0
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Permittivity of free space
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|
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μ0
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Magnetic permeability of free space
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σ
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Stefan-Boltzmann constant
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Φ0
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Magnetic flux quantum
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System Variables
|
Name
|
Default Value
|
Use
|
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TOL
|
0.001
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Controls the convergence precision of some functions such as integrals, derivatives, odesolve and the root functions.
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CTOL
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0.001
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Controls how closely a constraint in a solve block must be met for a solution to be acceptable when using find, minerr, minimize, or maximize.
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ORIGIN
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0
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Controls array indexing. You can reset ORIGIN to 1 on the Calculation tab, or you can redefine ORIGIN to another value in your worksheet.
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PRNPRECISION
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4
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Controls the number of significant digits to be used when writing to an ASCII data file with the WRITEPRN or APPENDPRN functions.
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PRNCOLWIDTH
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8
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Controls the width of columns in an ASCII data file created by the WRITEPRN or APPENDPRN functions.
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CWD
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Current working directory
(in the form of a string variable)
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Use this system variable as an argument to file handling functions.
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CustomFunctions
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When custom functions exist, each row holds information about a single custom function, where:
• First column—A string containing the filename of the DLL that contains the definition of the custom function.
• Second column—A string containing the name of the custom function.
• Third column—The custom function object. This value can be assigned to a variable to be used as the new function name, such as:
my_cust_func:=CustomFunctions0,2
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