expr

expr(
var
expr
l_values
)
=> o_waveform / nil

Description

Evaluates the expression expr by setting each of the values in the l_values list to the var variable in the expression.

A waveform object is created with l_values forming x vectors and the evaluated expr forming y vectors.

Arguments

var	Variable.
expr	Expression containing the variable var.
l_values	List of values of x vectors.

Value Returned

o_waveform	Waveform object created by evaluating the expression expr.
nil	because of an error.

Examples

The following example creates a Waveform window and returns its window ID.

win=awvCreatePlotWindow()

=> window:3

The following example creates a waveform object wave1 by evaluating the expression x*10 for different values of variable x. The expression is evaluated for different values of x vectors from 1 through 7.

wave1=expr(x (x*10) '(1 2 3 4 5 6 7))

=> srrWave:0x31180020

The following example plots the waveform object wave1 in the specified Waveform window, which is created using the awvCreatePlotWindow function.

awvPlotWaveform(

    win

    list(wave1)

    ?expr list("expr1")

    ?color list("y18")

    ?index list(1)

    ?lineType list("line")

    ?lineStyle list("solid")

    ?lineThickness list("thick")

    ?showSymbols list(t)

    ?dataSymbol list(3)

    )

=> t

The following example creates another Waveform window and returns its Window ID.

win=awvCreatePlotWindow()

=> window:4

The following example creates a waveform object wave2 by evaluating the expression sin(x) from x=-12.5 to x=15.5.

The expression is evaluated at x=-12.5, -12.0, -11.5,...,14.5, 15.0, and 15.5.

wave2=expr(x sin(x) linRg(-12.5 15.5 0.5))

=> srrWave:0x30bfb020

The following example creates a waveform object wave3 by evaluating the expression -sin(x) from x=-12.5 to x=15.5.

The expression is evaluated at x=-12.5, -12.0, -11.5,...,14.5, 15.0, and 15.5.

wave3=expr(x -sin(x) linRg(-12.5 15.5 0.5))

=> srrWave:0x30bfb030

The following example plots the waveform objects wave2 and wave3 in the specified Waveform window, which is created using the awvCreatePlotWindow function.

awvPlotWaveform(

    win

    list(wave2 wave3)

    ?expr list("expr1" "expr2")

    ?color list("y6" "y18")

    ?index list(1 2)

    ?lineType list("line" "line")

    ?lineStyle list("dash" "dash")

    ?lineThickness list("thick" "thick")

    )

=> t

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