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SEQUENCEName:
Specifically, you specify a start value, an increment, and a stop value. You can also optionally specify a repeat factor (this defaults to 1 if not specified). The 2010/11 version of Dataplot updated this command to support variable arguments for the start, increment, stop, and repeat factors. If more than one of these is a variable (as oppossed to a constant/parameter), then these variable must have the same length. If a variable is used for one or more of the arguments, then we essentially create k separate sequences (where k is the number of elements in the variable) and append the results together. Arguments that are entered as constants or parameters will use the same value for each sequence. In addition, a new syntax was added where the first argument is a list of values and the second argument is the number of times that each value is repeated. This syntax is useful when you want to generate a simple sequence with repeat values where the number of repeats is variable. See the Note section below for some examples of using this new syntax.
where <start> is a constant, parameter, or variable that specifies the beginning value for the sequence; <inc> is a constant, parameter, or variable that specifies the increment value of the sequence; <stop> is a constant, parameter, or variable that specifies the ending value of the sequence; and <resp> is a variable where the generated sequence is saved. This is the most common syntax for this command.
FOR I = <start2> <inc2> <stop2> where <start> is a constant, parameter, or variable that specifies the beginning value for the sequence; <inc> is a constant, parameter, or variable that specifies the increment value of the sequence; <stop> is a constant, parameter, or variable that specifies the ending value of the sequence; <start2> is a number or parameter that identifies the first row of <resp> in which the sequence is saved (typically it has a value of 1); <inc2> is a number or parameter that identifies the row increment of <resp> in which the sequence is saved (typically it has a value of 1); <stop2> is a number or parameter that identifies the last row of <resp> in which the sequence is saved; and <resp> is a variable where the generated sequence is saved.
This syntax is similar to syntax 1 except that the generated
sequence is repeated until the rows of
where <start> is a constant, parameter, or variable that specifies the beginning value for the sequence; <repeat> is a constant, parameter, or variable that specifies the number of times each value in the sequence is repeated; <inc> is a constant, parameter, or variable that specifies the increment value of the sequence; <stop> is a constant, parameter, or variable that specifies the ending value of the sequence; and <resp> is a variable where the generated sequence is saved. This syntax is useful for generating sequence like 1 1 1 2 2 2 3 3 3 4 4 4.
FOR I = <start2> <inc2> <stop2> where <start> is a constant, parameter, or variable that specifies the beginning value for the sequence; <repeat> is a constant, parameter, or variable that specifies the number of times each value in the sequence is repeated; <inc> is a constant, parameter, or variable that specifies the increment value of the sequence; <stop> is a constant, parameter, or variable that specifies the ending value of the sequence; <start2> is a number or parameter that identifies the first row of <resp> in which the sequence is saved (typically it has a value of 1); <inc2> is a number or parameter that identifies the row increment of <resp> in which the sequence is saved (typically it has a value of 1); <stop2> is a number or parameter that identifies the last row of <resp> in which the sequence is saved; and <resp> is a variable where the generated sequence is saved.
This syntax is similar to syntax 3 except that the generated
sequence is repeated until the rows of
where <values> is a constant, parameter, or variable that specifies the values for the sequence; <repeat> is a constant, parameter, or variable that specifies the number of times each value in <values> is repeated; and <resp> is a variable where the generated sequence is saved. This syntax is useful when the number of repeated values varies. For example, you can do something like
LET REP = DATA 3 3 2 4 4
LET X = SEQUENCE 1 1 10 FOR I = 1 1 100 LET X = SEQUENCE -4 9 1 4 LET X = SEQUENCE 1 50 1 2 FOR I = 1 1 100
you can enter the commands
LET STOP = DATA 5 33 67 LET Y = SEQUENCE START 1 STOP To generate the sequence
you can enter the command
LET REP = DATA 3 2 4 5 LET Y = SEQUENCE VAL REP Additional examples of using the variables with the SEQUENCE command are given in the Program section below.
2010/11: Added support for variables as arguments 2010/11: Added support for Syntax 5
LET X = SEQUENCE -4 1 4 FOR I = 1 1 81
LET Y = SEQUENCE -4 9 1 4
LET Z = X**2+Y**2-X*Y
LET Z0 = SEQUENCE 5 5 40
CONTOUR PLOT Z X Y Z0
Program 2:
set write decimals 1
.
. Step 1: First test basic current usage
.
let y = sequence 1 1 10
print y
---------------
Y
---------------
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
pause
delete y
.
let y = sequence 1 3 1 10
print y
---------------
Y
---------------
1.0
1.0
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pause
delete y
.
. Step 2: Now test "variable" syntax
.
let rep = data 1 2 3 1 2 3 1 2 3 1
let y = sequence 1 rep 1 10
print y
---------------
Y
---------------
1.0
2.0
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pause
delete y rep
.
let stop = sequence 10 1 1
let y = sequence 1 2 1 stop
print y
---------------
Y
---------------
1.0
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pause
delete y stop
.
let start = data 1 100 1000
let inc = data 1 10 100
let stop = data 10 1000 10000
let rep = data 3 2 1
let y = sequence start rep inc stop
print y
---------------
Y
---------------
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pause
delete y start rep inc stop
.
let start = data 1 2 3 4 5
let rep = data 5 3 1 4 2
let y = sequence start rep
print y
---------------
Y
---------------
1.0
1.0
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1.0
1.0
2.0
2.0
2.0
3.0
4.0
4.0
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pause
delete y start rep
Date created: 11/30/2010 |