This page describes the BLT vector command, not the concept of a vector in general.
A BLT vector is a one-dimensional ordered set of real numbers.
Vector command in BLT Synopsis vector create vecName ?vecName ...? ?switches? vector destroy vecName ?vecName ...? vector expr expression vector names ?pattern ? Description Creates a vector of floating-point values. Each vector is also a Tcl command (vecName ), with a Tcl array variable access to elements. Vectors support math expressions and can feed BLT graph, barchart, stripchart elements.
vector create vecName ?vecName ...? ?switches? : Create vectors. vecName may be name , name(size) , name(first:last) . Returns name(s).-variable varName : Tcl array variable bound to vector. Empty string = none.-command cmdName : Tcl command name for vector. Empty string = none.-watchunset boolean : Destroy vector when its variable is unset.vector destroy vecName ?vecName ...? : Destroy vectors, their commands and variables.vector expr expression : Evaluate vector expression, return result as list.vector names ?pattern ? : List vectors, optionally matching glob pattern . Vector Operations vecName append item ?item ...? : Append vectors or lists of values to end.vecName binread channel ?numValues? ?flags? : Read binary values from open channel . Flags: -swap , -format fmt .vecName clear : Clear indices cached in the vector.vecName delete index ?index ...? : Delete listed indices (or ranges first:last ).vecName dup destName : Copy vector to destName .vecName expr expression : Evaluate expression, assign result to vector.vecName length ?newSize ? : Return length, or resize.vecName merge vecName ?vecName ...? : Merge vectors' values into this one.vecName normalize ?vecName ? : Scale values to 0..1. Optionally store in vecName .vecName notify keyword : Control change notification: always , never , whenidle , now , cancel , pending .vecName offset ?value ? : Get/set index offset for the vector.vecName populate destName ?density? : Fill destName with values interpolated between this vector's points.vecName random ?seed ? : Fill with random values 0..1.vecName range first ?last? : Return values from first to last as list.vecName search ?-value ? value ?value? : Return indices where value (or range) found.vecName seq start ?finish? ?step? : Fill with sequence of values.vecName set item : Set values from list, vector, or expression result.vecName sort ?-reverse ? ?vecName ...? : Sort ascending; other vectors reordered alike.vecName split ?vecName ...? : Split into vectors (even/odd indices etc.).vecName variable ?varName ? : Get/set bound array variable. Indexing vecName(3) : single element.vecName(2:5) : range.vecName(min) , vecName(max) : index of smallest/largest value.vecName(end) : last element. vecName(++end) : append new element. Math Functions Usable in expr and vector expressions:
Element-wise: abs acos asin atan ceil cos cosh exp floor log log10 random round sin sinh sqrt tan tanh Reduce to scalar: adev kurtosis length max mean median min norm prod q1 q3 sdev skew sum var Vector-valued: sort Example vector create x y -variable ""
x seq 0 10 0.5
y expr {sin(x)}
set m [vector expr max(y)] Related pages In pure-Tcl , lists are most appropriate for representing vectors.