map with multiple inputs
It looks like the map command does not support multiple inputs to the specified function:
This is from http://www.cs.berkeley.edu/~bh/v1ch5/hof.html :
SHOW (MAP "sum [1 2 3] [40 50 60] [700 800 900])
but just produces a "number expected" error.
Live and learn, Andreas
Further reading in the http://www.cs.berkeley.edu/~bh/v1ch5/hof.html :
Map takes two inputs. The first is a word, which must be the name of a one-input Logo operation. The second can be any datum. The output from map is either a word or a list, whichever is the type of the second input. The members of the output are the results of applying the named operation to the members of the second input.
? show map "first [Rod Argent] [R A]
The Logo command SUM has two inputs, therefore it output as expecting another number because it does SUM 1 and it needs another number.
And further on the page there is the example with multiple inputs which seems useful.
Hmm.. this is probably a bug in the original Logo interpreter http://www.calormen.com/jslogo/ by Joshua Bell. I will see if I can fix it, or I will post this issue to Joshua at https://github.com/inexorabletash/jslogo
PS: Thanks for testing :-) Are you having another project in mind that will use MAP command?
In the jslogo provided manual map does take only one list, but an issue github could be good to document the behaviour.
I had planned on using map with multiple input for adding vectors in the same way as the example. I wanted to add all positions around the gear to average them in roder to find the center. Then, I found it more useful to generate gears around the origin in the first place, so this was not necessary anymore. But adding vectors seems useful in general for logo.
Andreas
Thanks for following up !