7. Wykresy, stringi, pliki.pdf

prof. dr hab. Krzysztof Jemielniak

PRZYRZĄDY

WIRTUALNE

Część 7

Wykresy, stringi,

pliki

http://www.cim.pw.edu.pl/labview

k.jemielniak@wip.pw.edu.pl

http://www.cim.pw.edu.pl/kjemiel

ST 149, tel. 660 8656

Politechnika Warszawska, Wydział Inżynierii Produkcji, Instytut Technologii Maszyn

Warszawa 2003

PRZYRZĄDY

WIRTUALNE

Wykresy ( Graphs )

• Znajdują się na palecie Controls>>All Controls>>Graphs

Przebiegi czasowe ( Waveform Chart )–były

już omawiane

Wykresy zmiennych ( Waveform Graph ) w

funkcji ich indeksów (numeru próbki)

Wykresy XY ( XY Graph i Express XY Graph ) –

wykresy funkcji

Wykresy cyfrowe ( DigitalWaveformGraph )

Politechnika Warszawska, Wydział Inżynierii Produkcji, Instytut Technologii Maszyn

VIs with graphs usually collect the data in an array and then plot the data to the graph.

The graphs located on the Controls» All Controls» Graph palette include the waveform graph and XY

graph. The waveform graph plots only single-valued functions, as in y = f( x ), with points evenly distributed

along the x-axis, such as acquired time-varying waveforms. Express XY graphs display any set of points,

evenly sampled or not. Resize the plot legend to display multiple plots. Use multiple plots to save space on

the front panel and to make comparisons between plots. XY and waveform graphs automatically adapt to

multiple plots.

Single-Plot Waveform Graphs

The waveform graph accepts a single array of values and interprets the data as points on the graph and

increments the x index by one starting at x = 0. The graph also accepts a cluster of an initial x value, a . x , and

an array of y data. Refer to the Waveform Graph VI in the examples\general\graphs\gengraph.llb for

examples of the data types that single-plot waveform graphs accept.

Multiple-Plot Waveform Graphs

A multiplot waveform graph accepts a 2D array of values, where each row of the array is a single plot. The

graph interprets the data as points on the graph and increments the x index by one, starting at x = 0. Wire a

2D array data type to the graph, right-click the graph, and select Transpose Array from the shortcut menu to

handle each column of the array as a plot. Refer to the (Y) Multi Plot 1 graph in the Waveform Graph VI in

the examples\general\graphs\gengraph.llb for an example of a graph that accepts this data type.

A multiplot waveform graph also accepts a cluster of an x value, a x value, and a 2D array of y data. The

graph interprets the y data as points on the graph and increments the x index by x, starting at x = 0. Refer to

the (Xo, x, Y) Multi Plot 3 graph in the Waveform Graph VI in the examples\general\graphs\gengraph.llb

for an example of a graph that accepts this data type.

A multiplot waveform graph accepts a cluster of an initial x value, a . x value, and an array that contains

clusters. Each cluster contains a point array that contains the y data. You use the Bundle function to bundle

the arrays into clusters, and you use the Build Array function to build the resulting clusters into an array. You

also can use the Build Cluster Array, which creates arrays of clusters that contain inputs you specify. Refer

to the (Xo, x, Y) Multi Plot 2 graph in the Waveform Graph VI in the

examples\general\graphs\gengraph.llb for an example of a graph that accepts this data type.

Single-Plot XY Graphs

The single-plot XY graph accepts a cluster that contains an x array and a y array. The XY graph also accepts

an array of points, where a point is a cluster that contains an x value and a y value. Refer to the XY Graph VI

in the examples\general\graph\gengraph.llb for an example of single-plot XY graph data types.

Multiplot XY Graphs

The multiplot XY graph accepts an array of plots, where a plot is a cluster that contains an x array and a y

array. The multiplot XY graph also accepts an array of clusters of plots, where a plot is an array of points. A

point is a cluster that contains an x value and a y value. Refer to the XY Graph VI in the

examples\general\graph\gengraph.llb for an example of multiplot XY graph data types.

Wykresy jednej zmiennej

Na osi X indeksy 0..max (co 1), wartości Y są

ciągiem liczb bez związku z czasem

macierz 1D

Na osi X określona skala czasu (punkt

początkowy i przyrost), Y jest funkcją

czasu

Politechnika Warszawska, Wydział Inżynierii Produkcji, Instytut Technologii Maszyn

Wykresy wielu zmiennych

Każdy wiersz macierzy jest oddzielnym

zbiorem danych (X 0 =0, ∆ X=1) nie

związanych z czasem

Każdy wiersz macierzy jest oddzielną

funkcją czasu

Politechnika Warszawska, Wydział Inżynierii Produkcji, Instytut Technologii Maszyn

If a 1D array is wired to a waveform graph, the graph assumes it is one plot. When a 2D array is wired to a

waveform graph, the graph assumes each row in that array is a separate plot.

Use the Build Array function to create a 2D array input for multiplot graphs:

Example 1: A combination of two single-plot examples with Xo and Delta X defined (Ex 1 from previous

slide). The Build Array function creates a cluster array input to the waveform graph. The terminal is an

array of clusters, because each graph is a cluster.

Example 2: A combination of two single-plot examples without Xo and Delta X defined (Example 2 from

the previous slide). The Build Array function creates a 2D array input to the waveform graph. The terminal

is a 2D array of double-precision numbers.

Wykresy ( Graphs )

Kliknięcie prawym klawiszem na wykresie

umożliwia określenie wielu jego właściwości

Politechnika Warszawska, Wydział Inżynierii Produkcji, Instytut Technologii Maszyn

Wykresy XY ( XYGraphs )

• Oś X nie jest jednostajna

• Wartości na obu osiach sa

zawarte w oddzielnych

wektorach (macierzach 1D)

• Są bardziej elastyczne niż

Waveform graph

Porównaj z budowaniem wykresu

dwóch zmiennych – tam było

budowanie macierzy, tu jest wiązanie

w klaster

Politechnika Warszawska, Wydział Inżynierii Produkcji, Instytut Technologii Maszyn

Generate two arrays, one for X values and other for Y values. Bundle arrays wire into the XY graph.

X array 1,2,3,4,5 and a Y array 0,1,0,1,0 will result in a graph with points ((1,0)(2,1)(3,0)(4,1)(5,0)).

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