asked on

Issues with determining Array Length

How to determine a variable length of an array where I am looking for the last two value in the array. Those last two values are always start with "vad" or "rate" but the array length size can be variable.

SOLUTION

Scott McDaniel (EE MVE )

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

cmdolcet

ASKER

Given your last statement is true which it is how could I pull out the value in the array.length-1 and array.length?

I need the actual value in the slot and not the index.

Scott McDaniel (EE MVE )

Can you show how you're creating the array?

ASKER CERTIFIED SOLUTION

it_saige

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

cmdolcet

ASKER

So I am looking at how to discover the values ( DistanceVar,RateVar)
The TempArray is array I am working with but how do I assign the DistanceVar and the RateVar which is always the last two slots in the array.

  If tempArray.Length > 0 Then
                    Me.ChartVel.ChartAreas(0).AxisX.Minimum = 0
                    Me.ChartVel.ChartAreas(0).AxisX.Title = "Time"
                    Me.ChartVel.ChartAreas(0).AxisY.Title = "m/s"
                   For intloopVel = 0 To tempArray.Length - 2
                        If intloopVel < 255 Then
                            Veldata.Add(tempArray(intloopVel))
                            Veltime.Add(tempArray(intlooptime))
                            x = Veltime(intloopVel)
                            x = 0.000001 * x
                            y = Veldata(intloopVel)
                            lstVelocityChartReadings.Items.Add(tempArray(intloopVel))
                            Me.ChartVel.Series(0).Points.AddXY(x, y)
                            If Veldata(intloopVel) >= PeakPoint Then
                                PeakPoint = Veldata(intloopVel)
                            End If
                            If value = 100 Then
                            Else
                                Application.DoEvents()
                                value = value + 0.5
                                PrgGraphBar.Value = value
                            End If
                            intlooptime = intlooptime + 1
                        End If
                    Next
                    VelErrorChartCounter = 0
                    PrgGraphBar.Value = 0
                    DistanceVar = tempArray(?)
                    RateVar = tempArray(?)
                    DistanceVar = DistanceVar.Remove(0, 6)
                    RateVar = RateVar.Remove(0, 7)
                    lblPeakValue.Text = PeakPoint
                    lblVelDistance.Text = DistanceVar
                    lblVelocityRateData.Text = RateVar
EndIf

Open in new window

it_saige

Quite simply:

DistanceVar = tempArray(tempArray.Length - 2)
RateVar = tempArray(tempArray.Length - 1)

Open in new window

This of course assumes that tempArray.Length - 2 and tempArray.Length - 1 are both valid indices.

-saige-

cmdolcet

ASKER

It_Sage,

What do you mean?

it_saige

Say tempArray has a length of 1, tempArray.Length - 1 = 0, where as tempArray.Length - 2 = -1. -1 is an invalid index.

-saige-