Dimensional analysis
Dimensional analysis allows you to verify that your calculations are dimensionally correct. The following paragraphs explain how to switch on dimensional analysis, and detail the dimensions of variables that can be used with mathematical operators or functions.
Switch on dimensional analysis (the Tedds Application)

On the Home tab, click Options.
The Options  Default dialog appears.

In the side pane, click Calculating.

Select the Perform dimensional checks option.
Switch on dimensional analysis (Tedds for Word)

In the Tedds ribbon group, click .
The Options  Default dialog appears.

In the side pane, click Calculating.

Select the Perform dimensional checks option.
Operators
For Tedds for Word users:
You can access most of the operators in the Library Access System. Go to .
Dimensional analysis operators  

Function  Input dimensions  Result dimensions  Example 
x + y = z x  y = z 
x and y must have identical dimensions  z has the same dimensions as x and y  (1m) + (1m) = 2m 
x × y = z x ÷ y = z 
x and y may have any dimensions  Dimensions of z result from those of x and y being multiplied and divided according to × or ÷ function  (1m) * (1m) = 1m^{2} 
(((...)))  Any  No change to dimensions  None 
y^{x} = Z 10^{x} 
x has to be dimensionless, y may have any dimension  z's dimension exponent is y's dimension altered by exponent x  (1m)^{5} = 1m^{5} 
Functions
For Tedds for Word users:
You can access most of the operators in the Library Access System. Go to .
General dimensional analysis functions  

Function  Input dimensions  Result dimensions  Example 
sqrt(x) = z  x may have any dimension  z's dimension exponent is x's halved  sqrt((1 m)) = 1 m^{0.5} 
abs(x) = z int(x) = z int(x,"unit") = z round(x,y) = z round(x,y,"units") = z mod(x, y) = z quotient(x,y) = z 
x may have any dimension, y has to be dimensionless  z has the same dimension as x  abs((1 m)) = 1 m 
sum(x,y,z,…) = z max(x,y,z,…) = z min(x,y,z,…) = z average(x,y,z,…) = z median(x,y,z,…) = z  All items being considered in the list (x,y,…) must have identical dimensions  z has the same dimensions as x and y  sum((1 m),(1 m)) = 2 m 
rand() = z  None  z is dimensionless  None 
Logarithmic and exponential dimensional analysis functions  

Function  Input dimensions  Result dimensions  Example 
ln(x) = z log(x) = z exp(x) = z 
x has to be dimensionless  z is dimensionless  None 
Trigonometric dimensional analysis functions  

Function  Input dimensions  Result dimensions  Example 
degrees(x,y,z) = a 
x, y and z have to be dimensionless. x can be in degrees or radians because those units are dimensionless. 
a is dimensionless, but may be in degrees or radians since they are dimensionless  degrees((1,30,0) = 1.5 ° 
sin(x) = z cos(x) = z tan(x) = z cosec(x) = z sec(x) = z cot(x) = z 
x has to be dimensionless because degrees and radians are dimensionless  z is dimensionless  sin (90 °) = 1 
asin(x) = z acos(x) = z atan(x) = z  x has to be dimensionless  z is dimensionless  but may be in degrees or radians since they are dimensionless  asin (1) = 90 ° 
Hyperbolic dimensional analysis functions  

Function  Input dimensions  Result dimensions  Example 
sinh(x) = z cosh(x) = z tanh(x) = z asinh(x) = z acosh(x) = z atanh(x) = z 
x has to be dimensionless  z is dimensionless  None 
Logical dimensional analysis functions  

Function  Input dimensions  Result dimensions  Example 
if(condition,x,y) and(x,y,z,...) (x && y) or (x,y,z,...) (x  y) x > y x >= y, x ≥ y x == y x <> y, x ≠ y x <= y, x ≤ y x < y 
All logical comparisons must be between values with identical dimensions  No change to dimensions, true and false are dimensionless  None 