Course contents 1 Labview basics virtual instruments data

Course contents 1. Labview basics – virtual instruments, data flow, palettes 2. Structures – – for, while, case, . . . editing techniques 3. Controls&Indicators – arrays, clusters, charts, graphs 4. Modular programming + recording – – Sub. VIs File I/O 5. Analysis – Linear algebra, Signal processing, Mathscript 6. Communication between loops – Producer/Consumer, State Machine, Local variables 7. Instrument control – DAQ, GPIB, Serial, Data collection

Array • Variable sized collection of data elements that are all the same type

Array • How to make an array from front panel

Array • Color of the icon reflects the data type of the array

Multidimensional array • How to add dimensions to the array

Auto-indexing • How to make an array from the block diagram

Auto-indexing • Auto-indexing on loops

Auto-indexing • Auto-indexing overrides the loop count setting

2 D array • Auto-indexing can create multidimensional arrays

Common wire types

Array functions • Array size • Initialize Array – input determines the data type – if zero is wired to dimension size an empty array is created

Array functions • Build Array – concatenates multiple arrays or appends elements

Array functions • Array subset: select a portion of an array

Array functions • Index array – select an element from an array

Polymorphism • Some functions accept inputs of different dimensions – such as add, multiply, divide

Cluster • Fixed-sized collection of data elements of mixed type • Reduces the number of wires and connector terminals in sub. VIs

Cluster order • Ordered according to when elements were placed in cluster

• Program won’t execute if there are inconcistencies in the cluster order

Cluster functions: Bundle • Assemble into a new • Replace old elements

Cluster functions: Unbundle • Extract components of a cluster

Cluster functions: (Un)bundle by name • Instead of cluster order one can refer to the cluster elements by name

Charts and Graphs • Chart show data by appending new data to existing plot • Graphs display pregenerated arrays

Waveform chart • One can select between three different update modes – Strip, scope, or sweep

Multiple traces on Chart • Depending on the input data, chart can show multiple plots or it can update multiple points on a single run – see Charts. vi for information (Help >> Find Examples >> Building User Interfaces >> Displaying Data >> Graphs and Charts >> Charts. vi)

Stacked plots • With multiple plots one can choose between stacked or overlayed plots

Clear chart • Empty the chart by selecting clear chart

Chart history • One can change the length of the chart history

Waveform graphs • Use graphs to plot existing data all at once • Ideal for uniformly distributed arrays • If only one array is wired to the graph, it assumes X 0=0 and ΔX=1

Waveform graph • Wire a cluster defining X 0 and ΔX

Multiple graphs • Bundle arrays to make multiple plots • For more ways to use waveform graphs see: – Help >> Find Examples >> Fundamentals >> Graphs and Charts >> Waveform Graph. vi

Cursors on Graphs • From Visible Items >> Cursor Legend one can create cursors – right-click on cursor legend and select Create Cursor – cursor can be Free or tied to the plot

Annotations on Graphs • One can create annotations to graphs – they can be free or tied to the plot

XY Graph • For uneven sample intervals or dependent variables (e. g. x vs y) • Possibility to build XY graph with Express VI – see also: Help >> Find Examples >> Fundamentals >> Graphs and Charts >> XY Graph. vi

Customizing charts and graphs • Autoscaling – Right-click and select autoscaling for X- or Y-axes – Scales the axes so that all data points are visible

Axes scaling • When Auto. Scaling is off one can change the axis scales by typing in the number that is needed

Plot properties • Appearance – change visibilities • Display Format – change format and precision of e. g. scale numbering • Plots – appearance of plots: name, line style, marker • Scales – tick styles, tick positions

Plot properties • One can change the line styles etc. from the Plot Legend

Graph palette • Graph palette can be used for zooming or to pan the graph zoom pan

Export image or data • Right-click >> Export

Keynotes