Hi Marina,
Please post more information on the exact calculation you are using. 
This could help: 
http://gis.stackexchange.com/questions/103122/how-to-generate-a-ndvi-in-qgis
Nicolas

Le 2016-04-05 10:34, Mariana Buzzi-2 [via OSGeo.org] a écrit :
> Thanks Nicolas!
> But...I check the CSR and It is right. I didn´t work with more than 
> one layer...
> Any idea please!???
>
> Regards,
> Mariana
>
> 2016-04-05 10:20 GMT-03:00 Nicolas Cadieux <[hidden email] 
> </user/SendEmail.jtp?type=node&node=5259748&i=0>>:
>
>     Hi,
>
>     I don't use NDVI raster calculation but if you have no data values
>     where you thinks you have some data, then my first reaction would
>     be to see if all the layers are in the same CRS in case the plugin
>     does not reprojection on the fly...
>
>     You are using more than one layer?  Maybe add information  on what
>     exactly you are doing. That would help others help you.
>     Cheers!
>
>     Nicolas
>
>     Nicolas
>
>     On Apr 5, 2016 08:45, "Mariana Buzzi-2 [via OSGeo.org] " <[hidden
>     email] <http:///user/SendEmail.jtp?type=node&node=5259730&i=0>> wrote:
>
>         Hi everybody!!!!
>
>         I'm doing a calculation with NDVI raster calculator. When I
>         generate the calculation results I get a lot of pixels without
>         values (no data). How I can do to fill those values with data?
>         Thank you so much!!!!
>
>         Regards,
>         Mariana
>
>
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