SigmaPlot comes with a simple, easytouse scripting language for manipulating data in an active worksheet. The scripting language can allocate memory to variables; perform looping, Boolean logic, and evaluate functions to transform a worksheet.
Worksheet transforms can be entered into either the Quick Transform dialog, or the UserDefined Transform dialog. New users will find the Quick Transform dialog to be a gradual introduction to single line transforms.
Experienced and more demanding users will find the UserDefined Transform dialog to be a powerful way to transform worksheet data. As of SigmaPlot 10, userdefined transforms can be stored as an item in a notebook along with the data.
The following list groups transforms by function type. It is followed by an alphabetical reference containing complete descriptions of all transform functions and their syntax, with examples.

Worksheet Functions
These worksheet functions are used to specify cells and columns from the worksheet, either to read data from the worksheet for transformation, or to specify a destination for transform results.

Function 
Description 
block 
The block function returns a specified block of cells from the worksheet. 
block height & width 
The blockheight and blockwidth functions return a specified block of cells or block dimension from the worksheet. 
cell 
The cell function returns a specific cell from the worksheet. 
col 
The col function returns a worksheet column or portion of a column. 
put into 
The put into function places variable or equation results in a worksheet column. 
subblock 
The subblock function returns a specified block of cells from within another block. 

Data Manipulation Function
The data manipulation functions are used to generate nonrandom data, and to sample, select, and sort data. 
Function 
Description 
data 
The data function generates serial data. 
if 
The if function conditionally selects between two data sets. 
nth 
The nth function returns an incremental sampling of data. 
sort 
The sort function rearranges data in ascending order. 

Trigonometrics Function
SigmaPlot and SigmaStat provide a complete set of trigonometric functions. 
Function 
Description 
arccos 
This function returns the arccosine of the specified argument. 
arcsin 
This function returns the arcsine of the specified argument. 
arctan 
This function returns the arctangent of the specified argument. 
cos 
This function returns the cosine of the specified argument. 
sin 
This function returns the sine of the specified argument. 
tan 
This function returns the tangent of the specified argument. 
cosh 
This function returns the hyperbolic cosine of the specified argument. 
sinh 
This function returns the hyperbolic sine of the specified argument. 
tanh 
This function returns the hyperbolic tangent of the specified argument. 

Numeric Functions
The numeric functions perform a specific type of calculation on a number or range of numbers and returns the appropriate results. 
Function 
Description 
abs 
The abs function returns the absolute value. 
exp 
The exp function returns the values for e raised to the specified numbers. 
factorial 
The factorial function returns the factorial for each specified number. 
mod 
The mod function returns the modulus, or remainder of division, for specified numerators and divisors. 
In 
The ln function returns the natural logarithm for the specified numbers. 
log 
The log function returns the base 10 logarithm for the specified numbers. 
sqrt 
The sqrt function returns the square root for the specified numbers. 

Range Functions
The following functions give information on ranges. 
Function 
Description 
count 
The count function returns the number of numeric values in a range. 
missing 
The missing function returns the number of missing values and text strings in a range. 
size 
The size function returns the number of data points in a range, including all numbers, missing values, and text strings. 

Accumulation Function
The accumulation functions return values equal to the accumulated operation of the function. 
Function 
Description 
diff 
The diff function returns the differences of the numbers in a range. 
sum 
The sum function returns the cumulative sum of a range of numbers. 
total 
The total function returns the value of the total sum of a range. 

Random Generation Function
The two “random” number generating functions can be used to create a series of normally or uniformly distributed numbers. 
Function 
Description 
gaussian 
The Gaussian function is used to generate a series of normally (Gaussian or “bell” shaped) distributed numbers with a specified mean and standard deviation. 
random 
The random function is used to generate a series of uniformly distributed numbers within a specified range. 

Precision Functions
The precision functions are used to convert numbers to whole numbers or to round off numbers. 
Function 
Description 
int 
The int function converts numbers to integers. 
prec 
The prec function rounds numbers off to a specified number of significant digits. 
round 
The round function rounds numbers off to a specified number of decimal places. 

Statistical Functions
The statistical functions perform statistical calculations on a range or ranges of numbers. 
Function 
Description 
avg 
The avg function calculates the averages of corresponding numbers across ranges. It can be used to calculate the average across rows for worksheet columns. 
max 
The max function returns the largest value in a range. 
min 
The min function returns the smallest value in a range. 
mean 
The mean function calculates the mean of a range. 
runavg 
The runavg function produces a range of running averages. 
stddev 
The stddev function returns the standard deviation of a range. stderr The stderr function calculates the standard error of a range. 
avg 
The avg function calculates the averages of corresponding numbers across ranges. It can be used to calculate the average across rows for worksheet columns. 
max 
The max function returns the largest value in a range. 
min 
The min function returns the smallest value in a range. 

Area and Distance Function
These functions can be used to calculate the areas and distances specified by X,Y coordinates. Units are based on the units used for X and Y. 
Function 
Description 
area 
The area function finds the area of a polygon described in X,Y coordinates. 
distance 
The distance function calculates the distance of a line whose segments are described in X,Y coordinates. 
partdist 
The partdist function calculates the distances from an initial X,Y coordinate to successive X,Y coordinates in a cumulative fashion. 

Curve Fitting Function
These functions are designed to be used in conjunction with SigmaPlot’s nonlinear curve fitter, to allow automatic determination of initial equation parameter estimates from the source data. You can use these functions to develop your own parameter determination function by using the functions provided with the Standard Regression Equations library provided with SigmaPlot. 
Function 
Description 
ape 
This function is used for the polynomials, rational polynomials and other functions which can be expressed as linear functions of the parameters. A linear least squares estimation procedure is used to obtain the parameter estimates. 
dsinp 
This function returns an estimate of the phase in radians of damped sine functions. 
fwhm 
This function returns the x width of a peak at half the peak’s maximum value for peak shaped functions. 
inv 
The inv function generates the inverse matrix of an invertible square matrix provided as a block. 
lowess 
The lowess algorithm is used to smooth noisy data. “Lowess” means locally weighted regression. Each point along the smooth curve is obtained from a regression of data points close to the curve point with the closest points more heavily weighted. 
lowpass 
The lowpass function returns smoothed y values from ranges of x and y variables, using an optional userdefined smoothing factor that uses FFT and IFFT. 
sinp 
This function returns an estimate of the phase in radians of sinusoidal functions. 
x25 
This function returns the x value for the y value 25% of the distance from the minimum to the maximum of smoothed data for sigmoidal shaped functions. 
x50 
This function returns the x value for the y value 50% of the distance from the minimum to the maximum of smoothed data for sigmoidal shaped functions. 
x75 
This function returns the x value for the y value 75% of the distance from the minimum to the maximum of smoothed data for sigmoidal shaped functions. 
xatxmax 
This function returns the x value for the maximum y in the range of y coordinates for peak shaped functions. 
xwtr 
This function returns x75x25 for sigmoidal shaped functions. 

Miscellaneous Functions
These functions are specialized functions which perform a variety of operations. 
Function 
Description 
choose 
The choose function is the mathematical “n choose r” function. 
histogram 
The histogram function generates a histogram from a range or column of data. 
interpolate 
The interpolate function performs linear interpolation between X,Y coordinates. 
polynomial 
The polynomial function returns results for specified independent variables for a specified polynomial equation. 
rgbcolor 
The rgbcolor(r,g,b) color function takes arguments r,g, and b between 0 and 255 and returns color to cells in the worksheet. 

Special Constructs
Transform constructs are special structures that allow more complex procedures than functions. 
Function 
Description 
for 
The for statement is a looping construct used for iterative processing. 
if... then... else 
The if...then...else construct proceeds along one of two possible series of procedures based on the results of a specified condition. 

Fast Fourier Transform Functions
These functions are used to remove noise from and smooth data using frequencybased filtering. 
Function 
Description 
fft 
The fft function finds the frequency domain representation of your data. 
invfft 
The invfft function takes the inverse fft of the data produced by the fft to restore the data to its new filtered form. 
real 
The real function strips the real numbers out of a range of complex numbers. 
img 
The img function strips the imaginary numbers out of a range of complex numbers. 
complex 
The complex function converts a block of real and/or imaginary numbers into a range of complex numbers. 
mulcpx 
The mulcpx function multiplies two ranges of complex numbers together. 
invcpx 
The invcpx takes the reciprocal of a range of complex numbers. 