Memory Problem
 

I keep getting an out of memory error (error 7) when I run this.

Dim DataArray As Variant
Din AMax As Long
Dim BMax As Long
Dim CMax As Long

AMax = 65000
BMax = 200
CMax = 1

ReDim DataArray(1 To AMax, 1 To BMax, 1 To CMax)

Am I simply running too many loops for excel to handle?


---
Message posted from http://www.ExcelForum.com/

Memory Problem
 

I don't think Excel is the problem. 65,000 is a lot of elements and o
top of that you're doing it 200 times (13,000,000 total elements i
your array!). Take a look at how much memory you have in the firs
place and how many applications you have running. Try cutting tha
number in half and see how it works and then try to determine exactl
what the magic number is that makes this happen.

Also, because CMAX = 1, the array ReDim DataArray(1 To AMax, 1 To BMax
is a simpler way to do the exact same thing. - Piku

--
Message posted from http://www.ExcelForum.com

Memory Problem
 

What version of Excel are you using? You're probably running up
against Excel's own memory limitations. See
http://www.decisionmodels.com/memlimitsc.htm for more detailed
information. You're allocating 13,000,000 elements in the array,
each a variant. A variant requires 22 bytes of memory plus
memory to hold the contents of the variant, so right out of the
box you're allocating about 286MB. Once you start putting values
in the array, you'll go even higher.


--
Cordially,
Chip Pearson
Microsoft MVP - Excel
Pearson Software Consulting, LLC
www.cpearson.com



"ExcelMonkey " wrote
in message ...
I keep getting an out of memory error (error 7) when I run
this.

Dim DataArray As Variant
Din AMax As Long
Dim BMax As Long
Dim CMax As Long

AMax = 65000
BMax = 200
CMax = 1

ReDim DataArray(1 To AMax, 1 To BMax, 1 To CMax)

Am I simply running too many loops for excel to handle?


---
Message posted from http://www.ExcelForum.com/

Memory Problem
 

Do you realize what you are doing? You are creating a multi-dimensional array 65000x200x1

Ignore the 1

What is 65,000 to the power of 200?

Right, a really big number.

This has nothing to do with loops. It has everything to do with memory allocation, and I don't care how much you spend on RAM SIMMs you're not going to get there.

Now tell us what you're really trying to accomplish because this is never going to work.

Memory Problem
 

You will need up upgrade your computer to do that. I have 3.7Gh
(overclocked) with 1GB Ram and I can do it very easily, it does use u
about 20% of my Ram right off the bat. I tried including 2 screenshot
so you can look and see what it is doing in your ram but it is too big
email me if you want the pics.

keith
www.kjtfs.co

--
Message posted from http://www.ExcelForum.com

Memory Problem
 

Not quite 65,000 to the power 200, more like 65,000 x 200 - still a big
number and your going to break something I suspect!

"medialint" wrote in message
...
Do you realize what you are doing? You are creating a multi-dimensional
array 65000x200x1

Ignore the 1

What is 65,000 to the power of 200?

Right, a really big number.

This has nothing to do with loops. It has everything to do with memory
allocation, and I don't care how much you spend on RAM SIMMs you're not
going to get there.

Now tell us what you're really trying to accomplish because this is never
going to work.







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Memory Problem
 

Yes I support the above theory of x*y elements. Ex, a 5 by 2 array
(will will say base 1!!)

1,1
1,2
2,1
2,2
3,1
3,2
4,1
4,2
5,1
5,2


that is 10 elements not 25. 5*2 = 10 So the element growth is linear
not exponential but it still adds up quick.

Keith
www.kjtfs.com


---
Message posted from http://www.ExcelForum.com/

Memory Problem
 

sorry for the hiatus. I am looking to forecast hourly data over 15 or
more years. Ignoring leaps years gives me 8670 hours per year. 8670*15
years = 131,400 elements.

I then want to do this stochastically. Thus my 1D array will need to
be 131,400 elements, and my 2D array will need to incorporate the
stochastic runs (i.e. 1,000 or so).

I justed used 65,000 becuase I was going to print the array data to
excel to see if I was doing it right. If 65,000 by 1,000 doesn't work
then I do not know how I will get around needing 131,400 by 1,000.

When you use hourly data over large time period, excel just doesn't cut
it due to its memory issues. Models get bogged down due to large
amount of data. I was hoping that VBA would be the answer for this.


---
Message posted from http://www.ExcelForum.com/

Memory Problem
 

For that amount of data you will need a database or even better sometyp
of programmed data structure might be more efficient, like a linke
list or something like that.

Keith
www.kjtfs.co

--
Message posted from http://www.ExcelForum.com

Memory Problem
 

Consider uing SPSS as a data exploratory tool for this type of analysis
http://www.spss.com

Cheers
Nigel


"ExcelMonkey " wrote in message
...
sorry for the hiatus. I am looking to forecast hourly data over 15 or
more years. Ignoring leaps years gives me 8670 hours per year. 8670*15
years = 131,400 elements.

I then want to do this stochastically. Thus my 1D array will need to
be 131,400 elements, and my 2D array will need to incorporate the
stochastic runs (i.e. 1,000 or so).

I justed used 65,000 becuase I was going to print the array data to
excel to see if I was doing it right. If 65,000 by 1,000 doesn't work
then I do not know how I will get around needing 131,400 by 1,000.

When you use hourly data over large time period, excel just doesn't cut
it due to its memory issues. Models get bogged down due to large
amount of data. I was hoping that VBA would be the answer for this.


---
Message posted from http://www.ExcelForum.com/





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