octave windows 2.9.12-3 Question

[helloman]

I have installed Batemans compiled octave 2.9.12 for windows. I have selected
all the packages in the options. I have 3 questions on the octave. I am very
recent to octave, so please bear me if its a silly question.

1. When I am trying to use -> pkg load all, I am getting this warning. is
there any way to get rid of this warning.
-----------------------------------------------------------------------
'which' is not recognized as an internal or external command,
operable program or batch file.
gmsh does not seem to be present some functionalities will be disabled
'which' is not recognized as an internal or external command,
operable program or batch file.
dx does not seem to be present some functionalities will be disabled
-----------------------------------------------------------------------

2. x=chirp([0:0.001:2],0,2,500);
specgram(x,128,1000,100,80) 
This command is not giving me the full spectrum. The spectrum by default is
in gray. Is there a way to change it to RGB.

3. Is it possible to update the gnuplot from 4.0 to 4.2. Is 4.2 stable? 
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