Return previous row value in rdlc martrix - rdlc

Good day, I'm working with matrix for rdlc report. I'm trying to use "previous" function of rdlc in the matrix but it is not working because it is not supported by matrix tool. Does anyone know how can I achieve this result from matrix?
=IIF(Fields!CheckinCount.Value > 0,Fields!CheckinCount.Value,previous(Fields!CheckinCount.Value))

It appears it's not possible.
"Not supported in chart or matrix data regions."
Source: http://msdn.microsoft.com/en-us/library/ms251678(v=vs.90).aspx

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Custom SUMIF function in SSRS

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Please see the image attached:
Sample Data
I have tried many versions of a public function and I am still getting the #Error result.
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It looks like my issue was that I was missing CINT() for the field values. I added them and it seems to be working fine.
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Updated
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http://www.allaboutreports.com/index.php/tag/can-grow/
http://docs.imis.com/15.2/index.htm#!tipsandtrickscrystalreports.htm

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Regards,
N.SRIRAM
Im having trouble to do this my self as well in a tablix, but I found this code, I think it may help
=iif(Fields!field.Value >= 85 , "PaleGreen", "White")
Put that in the color dialog, in the fx section.
hope it helps