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16 bytes removed ,  18:55, 22 September 2016
→‎Find if a package is installed: use pkg list instead of pkg describe, because describe has an odd behaviour
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==== Solution ====
 
==== Solution ====
   −
Use {{codeline|pkg ("describe", pkg-name)}} like so:
+
Use {{codeline|pkg ("list", pkg-name)}} like so:
   −
  if (! isempty (pkg ("describe", "foo")))
+
  if (! isempty (pkg ("list", "foo")))
 
   ## use functions from package foo, the prefered way
 
   ## use functions from package foo, the prefered way
  elseif (! isempty (pkg ("describe", "bar")))
+
  elseif (! isempty (pkg ("list", "bar")))
 
   ## use functions from package bar, not so optimal
 
   ## use functions from package bar, not so optimal
 
  else
 
  else
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  ## Again, doesn't add anything.  The failure of 'pkg load' is enough
 
  ## Again, doesn't add anything.  The failure of 'pkg load' is enough
  if (isempty (pkg ("describe", "foo")))
+
  if (isempty (pkg ("list", "foo")))
 
   error ("program: package foo is not installed");
 
   error ("program: package foo is not installed");
 
  endif
 
  endif

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