Re: headless vectors?

[Steve Hankin <hankin@xxxxxxxxxxxxx>]

Hi Billy,

Have a look at the scripts
    % Fgo -more scattered_vectors
and
    % Fgo -more centered_vectors
which uses the first

This is an example of a completely "manual" way to create vectors. In
centered_vectors.jnl we create vectors where the grid point is at the middle of the
vector shaft rather than at the "feather" end of the arrow. A slight hack on this script
could easily produce vectors without arrow heads. (scattered vectors.jnl actually has an
input option to suppress the vector heads.

Note that these are fairly old scripts -- they involve writing the data to an
intermediate file. I strongly suspect that Ferret V5 (& higher) can perform the same
function without the intermediate file.

    - steve

========================================

Billy Kessler wrote:

> Anyone know how to make headless vectors? I am showing
> both the amplitude and phase of a harmonic decomposition
> as vectors:
>
> AMP*cos(omega*t-PHASE) = A*sin(omega*t) + B*cos(omega*t)
>
> So I am vectoring A and B. The length of the vector shows
> the amplitude, and the direction shows the phase (read like
> a clock). It's very convenient for comparison (for example
> you can overlay two fields). See an example at:
>
> http://www.pmel.noaa.gov/~kessler/pacs/inverse/curl-n-dz20dt-1cpy-harmonics-swca.gif
>
> But in these cases the vector head is superfluous. Anyone
> know how to make vectors without 'em?
>
> Thanks, Billy K

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