Upgrading from MATLAB 4 to MATLAB 5.0     Search    Help Desk 

New Data Analysis Features

MATLAB 5.0 provided an expanded set of basic data analysis functions.

Table 1-15: New Statistical Data Analysis Functions
Function
 Description
convhull
 Convex hull.
cumtrapz
 Cumulative trapezoidal numerical integration.
delaunay
 Delaunay triangularization.
dsearch
 Search for nearest point.
factor
 Prime factors.
inpolygon
 Detect points inside a polygonal region.
isprime
 True for prime numbers.
nchoosek
 All possible combinations of n elements taken k at a time.
perms
 All possible permutations.
polyarea
 Area of polygon.
primes
 Generate a list of prime numbers.
sortrows
 Sort rows in ascending order.
tsearch
 Search for enclosing Delaunay triangle.
voronoi
 Voronoi diagram.

MATLAB 5.0 also offered expanded data analysis in the areas of:

Higher-Dimension Interpolation

The new functions interp3 and interpn let you perform three-dimensional and multidimensional interpolation. ndgrid provides arrays that can be used in multidimensional interpolation.

Table 1-16: New Interpolation Functions
Function
 Description
interp3
 Three-dimensional data interpolation (table lookup).
interpn
 Multidimensional data interpolation (table lookup).
ndgrid
 Generate arrays for multidimensional functions and interpolation.

griddata Based on Delaunay Triangulation

griddata supports triangle-based interpolation using nearest neighbor, linear, and cubic techniques. It creates smoother contours on scattered data using the cubic interpolation method.

Set Theoretic Functions

The functions union, intersect, ismember, setdiff, and unique treat vectors as sets, allowing you to perform operations like union , intersection , and difference of such sets. Other set-theoretical operations include location of common set elements (ismember) and elimination of duplicate elements (unique).

Table 1-17: New Set Functions  
Function
 Description
intersect
 Set intersection of two vectors.
ismember
 Detect members of a set.
setdiff
 Return the set difference of two vectors.
setxor
 Set XOR of two vectors.
union
 Set union of two vectors.
unique
 Return unique elements of a vector.


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