If the range where you're picking up those values is contiguous, you can use a
single statement:

#1.
Dim myVals as variant
myvals = worksheets("sheet1").range("a1:d500").value

2&3. Loop through each element to add and plop it all back to the worksheet at
once:

dim rCtr as long
dim cCtr as long

dim myArr1(1 to 10, 1 to 4) as long
dim myArr2(1 to 10, 1 to 4) as long
dim myArr3(1 to 10, 1 to 4) as long

'put something in the arrays for testing
for rctr = lbound(myarr1, 1) to ubound(myarr1,1)
for cctr = lbound(myarr1,2) to ubound(myarr1,2)
myarr1(rctr, cctr) = rctr + cctr
myarr2(rctr, cctr) = rctr * cctr
next cctr
next rctr

'Add them
for rctr = lbound(myarr1, 1) to ubound(myarr1,1)
for cctr = lbound(myarr1,2) to ubound(myarr1,2)
myarr3(rctr, cctr) = myarr1(rctr, cctr) + myarr2(rctr, cctr)
next cctr
next rctr

'put the new array in E1:h10
activesheet.range("e1") _
.resize(ubound(myarr3,1)-lbound(myarr3,1)+1, _
ubound(myarr3,2)-lbound(myarr3,2)+1).value = myarr3


All untested, uncompiled--watch for typos!




wrote:

All:

First let me say that I am a programming neophyte, but I still need
your assistance. I have tried to do my homework; however, I am
certain that I am missing something.

My goal is to:
1. Read a range into a multi-dimensional array, 4 columns by 500
rows. Each column is or could be an array within the multi-
dimension array.
2. Modify input data such that the original array is different than
the current.
3. Add the original array to the modified array.
4. Repeat this addition of previous array and current array for a
fixed number of iterations.
5. Write the cumulative summation array to a worksheet.

My challenges a
1. How to create and test a multi-dimensional array.
2. How to add two multi-dimensional arrays.
3. How to write a multi-dimensional array to a worksheet.

Any guidance would be greatly appreciated.

Here is what I have so far:

Sub BuildCompositeProductionProfiles()
Dim NumberOfPatterns As Integer
Dim NumberOfForecastedMonths As Integer
Dim OilRateArray As Variant
Dim WaterRateArray As Variant
Dim GasRateArray As Variant
Dim InjWaterArray As Variant

Dim AllStreamsArray() As Variant

'Initialize counters
NumberOfPatterns = 75
NumberOfForecastedMonths = 500

'Call routine to build multi-dimensional array
Call BuildAllStreams(AllStreamsArray, NumberOfForecastedMonths,
OilRateArray, WaterRateArray, GasRateArray, InjWaterArray)

End Sub

Sub BuildAllStreams(AllStreamsArray, NumberOfForecastedMonths As
Integer, OilRateArray, WaterRateArray, GasRateArray, InjWaterArray)
Dim AllStreamsRange As Range

With Worksheets("ThruPut")
Set AllStreamsRange = .Range("AO8:AR" &
NumberOfForecastedMonths + 7)
End With

AllStreamsArray = Application.Transpose(AllStreamsRange) [Error #1]

ReDim Preserve AllStreamsArray(1 To NumberOfForecastedMonths)
[Error #2]

[Error #3]
'Dim i As Integer
'For i = LBound(AllStreamsArray) To UBound(AllStreamsArray)
'Debug.Print AllStreamsArray(OilRateArray(i), WaterRateArray(i),
GasRateArray(i), InjWaterArray(i)), i
'Next i

End Sub

Floyd

--

Dave Peterson