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 – SubVIs – 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

2D 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 subVIs

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 auto- scaling for X- or Y-axes – Scales the axes so that all data points are visible

Axes scaling When AutoScaling 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