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From: Gaurav Pandey on 6 Aug 2010 19:57
Hi,

I am trying to save a couple of matrices into a mat file in a Matlab session (version 7.6.0.324), but keep getting the following error:

"Warning: Variable 'go_selected_label_info' cannot be saved to a MAT-file whose version is older than 7.3.
To save this variable, use the -v7.3 switch.
Skipping..."

I have never faced this error earlier, despite having run the same operation many many times before. When I indeed used the -v7.3 switch as:

"save -v7.3 a.mat go_selected_label_info"

a mat file of over 500 MB is generated, which is really strange given that the stuff being saved into come from a much larger set of matrices saved into a mat file that is only 2.6 MB!

Needless to say, I can't do much with this mat file, since just loading it into a matlab session takes over an hour and often crashes due to the low amount of memory available.

Please help in fixing this problem. Thanks in advance!

Gaurav
From: Walter Roberson on 7 Aug 2010 23:24
Gaurav Pandey wrote:

> I am trying to save a couple of matrices into a mat file in a Matlab
> session (version 7.6.0.324), but keep getting the following error:
>
> "Warning: Variable 'go_selected_label_info' cannot be saved to a
> MAT-file whose version is older than 7.3.
> To save this variable, use the -v7.3 switch.
> Skipping..."
>

The variable is either more than 2 Gb or includes objects.

> I have never faced this error earlier, despite having run the same
> operation many many times before. When I indeed used the -v7.3 switch as:
>
> "save -v7.3 a.mat go_selected_label_info"
>
> a mat file of over 500 MB is generated, which is really strange given
> that the stuff being saved into come from a much larger set of matrices
> saved into a mat file that is only 2.6 MB!

Is it a sparse matrix?

> Needless to say, I can't do much with this mat file, since just loading
> it into a matlab session takes over an hour and often crashes due to the
> low amount of memory available.

-v7.3 format does not appear to use any compression at all, and is often
larger than the data being saved, and is often very very slow. :(
From: Gaurav on 9 Aug 2010 14:17
On Aug 7, 8:24 pm, Walter Roberson <rober...(a)hushmail.com> wrote:
> GauravPandeywrote:
> > I am trying to save a couple of matrices into a mat file in a Matlab
> > session (version 7.6.0.324), but keep getting the following error:
>
> > "Warning: Variable 'go_selected_label_info' cannot be saved to a
> > MAT-file whose version is older than 7.3.
> > To save this variable, use the -v7.3 switch.
> > Skipping..."
>
> The variable is either more than 2 Gb or includes objects.
>
> > I have never faced this error earlier, despite having run the same
> > operation many many times before. When I indeed used the -v7.3 switch as:
>
Thanks for the info. However, I really want to understand the root of
this problem -- why am I being asked to save this mat file in v7.3
format?! I have never faced this problem before!

> > "save -v7.3 a.mat go_selected_label_info"
>
> > a mat file of over 500 MB is generated, which is really strange given
> > that the stuff being saved into come from a much larger set of matrices
> > saved into a mat file that is only 2.6 MB!
>
> Is it a sparse matrix?
>
> > Needless to say, I can't do much with this mat file, since just loading
> > it into a matlab session takes over an hour and often crashes due to the
> > low amount of memory available.
>
> -v7.3 format does not appear to use any compression at all, and is often
> larger than the data being saved, and is often very very slow. :(

From: Jan Simon on 9 Aug 2010 15:32
Dear Gaurav,

> "Warning: Variable 'go_selected_label_info' cannot be saved to a MAT-file whose version is older than 7.3.

Did you already told us the type of this variable?
whos go_selected_label_info

Kind regards, Jan
From: Gaurav on 11 Aug 2010 14:56
Hi Jan,

"go_selected_label_info" is a structure. Is that the root of the
problem?

Sorry for the late response, but hopefully people will help me debug
this soon!

Thanks,

Gaurav



On Aug 9, 12:32 pm, "Jan Simon" <matlab.THIS_Y...(a)nMINUSsimon.de>
wrote:
> Dear Gaurav,
>
> > "Warning: Variable 'go_selected_label_info' cannot be saved to a MAT-file whose version is older than 7.3.
>
> Did you already told us the type of this variable?
>   whos go_selected_label_info
>
> Kind regards, Jan

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