Plotting library

Comment from GM Culp -- February 26, 2011, 10:38:04 PM    

Good afternoon, Stéphane!

I have been learning about plotting in SciLab and I think I understand a bit more about
what 
I want to do than at the time of my last post. I would like to fit a surface to a a set of

3d data.  I am using your convex_hull_3d function 
(http://www.mathkb.com/Uwe/Forum.aspx/scilab/2/create-surface-for-discrete-3d-data)
which 
employs functions of the plotlib toolbox.  It works well with plain matrices but I can't
get 
it to work with RGB data from an image matrix.  I keep getting the following error:

Wrong type for first argument: Square matrix expected.

Here's my faulty code for matrix generation:

DemoPath = 'C:\sci_test';
A = imread(DemoPath + '\fruity-rainbow.jpg');
RGBD = double(A) / 255;
LAB = RGB2LAB(RGBD);
xyz=[LAB(:,:,1); LAB(:,:,2); LAB(:,:,3)];


I bet my mistake is a silly one.

Thanks!

Gretchen

Answer from Stéphane MOTTELET -- February 26, 2011, 11:05:54 PM    

> Good afternoon, Stéphane!
> 
> I have been learning about plotting in SciLab and I think I understand a bit more about
> what 
> I want to do than at the time of my last post. I would like to fit a surface to a a set
> of 
> 3d data.  I am using your convex_hull_3d function 
> (http://www.mathkb.com/Uwe/Forum.aspx/scilab/2/create-surface-for-discrete-3d-data)
> which 
> employs functions of the plotlib toolbox.  It works well with plain matrices but I can't
> get 
> it to work with RGB data from an image matrix.  I keep getting the following error:
> 
> Wrong type for first argument: Square matrix expected.
> 
> Here's my faulty code for matrix generation:
> 
> DemoPath = 'C:\sci_test';
> A = imread(DemoPath + '\fruity-rainbow.jpg');
> RGBD = double(A) / 255;
> LAB = RGB2LAB(RGBD);
> xyz=[LAB(:,:,1); LAB(:,:,2); LAB(:,:,3)];
> 
> 
> I bet my mistake is a silly one.
> 
> Thanks!
> 
> Gretchen


Please send me this message at stephane.mottelet@utc.fr !

Thanks,

S.

Comment from arron lee -- June 16, 2014, 08:30:47 AM    

Hi, I wonder whether anyone has some experience about related online data matrix
generating
projects(http://www.keepautomation.com/products/net_barcode/barcodes/data_matrix.html)?
I
am totally a green hand on this field. Any suggestion will be appreciated. Thanks in
advance.