Hello,
There are a couple of things to note here, which might help. They are
under the Crosspeaks -> Peak Find Parameters dialog.
At the top there is an "Extrema to search for" option, the default is
"positive only" but you can also pick negative (or both).
There is also an option in "Other parameters" (same dialog) under that
called "Extra thickness in orthogonal dims (in points)". If you set that
to 1 (say) then the peaks in +- 1 planes from the orthognal region you
have used will also be searched. Say you have one plane in view (in a 3D)
and try to pick a peak where you can see contours. If that peak happens
to have its maximum in the "next" plane then no peak will be found if that
"Extra thickness" is set to 0 (the default) because the extremum does not
lie in the viewed plane, but if it is set to 1 it will be found. My guess
is this might be what you are observing.
There are also some keyboard shortcuts worth noting. If you toggle the
keys 0-9 then that also toggles the spectra (if you don't like using the
toggle buttons because it involves the mouse). Obviously this only allows
up to 10 spectra to be toggled that way. The first ten spectra loaded
will be the ones selected by default but you can change the spectra (and
the value for each one) by going into the Experiment -> Edit Spectra
dialog and changing the values in the "Shortcut" column.
If you want to zoom then you can also use the "page up" and "page down"
keys.
If you want to place a peak at a specific location then you can use just
ctrl left click to do so.
Wayne
On Fri, 16 Dec 2005, Murali Vadivelu wrote:
> Dear Developers,
>
> I am working on a bit complicated spectra and analysis does not
> always pick a peak when 'control + shift' drag my left mouse button.
> I need to toggle off all the other spectra and do 'R:Peak:Add a peak'
> to add a peak. Moreover, there are negative contours in some spectra,
> like CA in HNCACB and some CO Cs in HNCACO. These does not get picked
> either.
>
> I find that I am spending way too much time/ effort having to toggle
> on and off the spectra. It would be nice if I can choose the spectra
> and place a peak in one go, say using a couple of clicks (a left
> click to choose a spectra and a right click menu to add a peak) would
> be nice. I find it hard to use the right click menu mentioned above
> as it adds peak to all the toggled on spectra.
>
> Is there way to make analysis pick negative peaks on 'control +
> shift' drag of the left mouse button?
>
> Would it be possible for the tabs to show the colour of the negative
> contours also with a legend maybe?
>
> I am unable to resize spectra (zoom in and out) using the right lower
> corner box before I once use the R:Zoom in by 2 or R:Zoom out by 2
> menu. Once the R: menu is used at least once, I am able to use the
> right lower corner box as expected. This happens after loading a
> spectra afresh.
>
> Many thanks.
>
> Best,
> Murali.
>
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