PDL: The Perl Data Language:
Tables and Examples
Software Careers Fall 1997 Dr. Dobb's Journal
by Karl Glazebrook and Frossie Economou
Jump to Table 1
Examples:
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Tables
<B>(a)</b>
<hr>
+ - * / > < >= Array operators/functions
<= << >> & (same as Perl and C
| ^ == != += but they act element by
-= *= /= %= element)
**= <<= >>=
&= |= ^= <=>
** % ! ++ -
"" atan2* sqrt*
sin* cos* log*
exp* abs*
X Matrix multiplication
~ Matrix transpose
byte short Type conversions
ushort long
float double
convert
pdl Create/copy a piddle
topdl Coerce to piddle if scalar
howbig Size of piddle datatype in bytes
nelem Number of elements
dims Return list of dimensions
inplace Perform operation in place
list Convert piddle to list, e.g.
for (list $x) { }
listindices Return list of index values (1D)
log10* Take log base 10
min max sum Min/max/sum of piddle
zeroes ones Create zero/one-filled piddle
sequence Create sequence-filled piddle
reshape Reshape the dimensions of a piddle
sec Subsection of a piddle
int* set Insertion/Setting
at Return pixel value at (x, y, z, ...)
axisvals* Fill piddle with axis values
xvals*
yvals*
zvals*
rvals Fill piddle with distance from its
center
callext Call external C code in dynamically
loadable object
convolve Convolve image with kernel (real space)
hist Histogram of data
stats Return mean and standard deviation
transpose Matrix transpose
qsort* Quick sort piddle
median Median of piddle
oddmedian Lower odd median of piddle
<B>(b)</B>
<hr>
fibonacci* Compute Fibonacci series (simple 1D example)
cc8compt* Connected 8-component labelling (2D example)
<B>(c)</B>
<hr>
rfits Read a FITS format file
wfits Write a FITS format file
rcols Read columns in a text file into piddles
rgrep Read <I>regexp</I> matches into piddles
rdsa Read a DSA format file (Starlink systems only)
<B>(d)</B>
<hr>
imag Display an image
ctab Load an image color table
line Plot vector as connected points
points Plot vector as points
errb Plot error bars
cont Display image as contour map
bin Plot vector as histogram (<I>bin hist $data</I>,
for instance)
hi2d Plot image as 2D histogram
poly Draw a polygon
vect Display two images as a vector field
hold Hold current plot window range;
for example, for overlays
release Autoscale new plot window for each command
rel Synonym for "release"
env Define a plot window, put on "hold"
dev Explicitly set a new PGPLOT graphics device
<B>(e)</B>
<hr>
iis Display image
iiscur Return a cursor position
iiscirc Draw circles on image display
saoimage Start SAOimage
ximtool Start Ximtool
<B>(f)</B>
<hr>
flush Update C cache from piddle Perl
data structure
copy Copy a piddle
new Create a piddle
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| Table 1: PDL 1.11 functions. Starred items (log10*, for instance) act as mutators: When you say log10(inplace($a)), every element of $a is replaced with its logarithm base 10. (a) Defined in PDL::Core; (b) defined in PDL::Examples; (c) defined in PDL::Io; (d) defined in PDL::Graphics::PG (PGPLOT graphics); (e) defined in PDL::Graphics::IIS (talk to IIS protocol image display widget); (f) PDL methods. |
DDJ
