LispForum

Surely there's a lisper out there that can win this.

https://www.elance.com/j/lisp-website-a ... n/28604330

Tom

You know your problem domain better than I do; if you say that you've got objects that are best described with optional slots, I'll believe it. In anycase, this thread seemed an appropriate place for some function timing information I gleaned from SBCL. If you disagree, I'll move it elsewhere. I th...

I think you two are fighting over nothing. It is obvious that every case has its proper tool and vice versa. Sometimes a constructor makes things clearer and easier, and that's why structs provide constructors which can be customized to use optional or required parameters. Sometimes they are almost...

Why does your object have optional slots? Don't you end up with dozens of test to determine if an optional slots is bound before you use it? Could you instead provide appropriate dummy values to the optional slots and use algorithms that requires less decisions? This would make every slot have equa...

The primary goal of that constructor interface I outlined is to clearly delineate the necessary and optional arguments. The secondary goal of the constructor interface is to work with your IDE to provide feedback when you are using the interface. The 2 IDE's that I am familiar with are SLIME and Lis...

It seems that I learn something new about Common Lisp just about every day. As I learn more about Common Lisp, I often cringe at some hack that I've employed in my code as a result of my ignorance. I'd like this topic to be a place for people to post their lesson of the day. Today's lesson relates t...

Java will be more useful for your problem given 2 conditions: 1. You already know how to program in Java. 2. There is an existing Java library that performs pattern matching appropriate for your problem. Then you will only need to learn how to use the library and at most may have to modify or extend...

Just to be clear, you are writing your own exponent function for practice, right? Otherwise, you should use EXPT.

Good luck,

~ Tom

Surprisingly, Alexandria's READ-FILE-INTO-STRING was only slightly faster than my wonky read-line/append function, and left unwanted newlines in the output. I think if I filter out the whitespace, the two will be pretty much equivalent. This is not that surprising, since such operation would would ...

Using MAPCAR and REDUCE is fine. As an alternative approach, you could LOOP. (defun notmapcar (list1 list2) "(list1 x list2) / Sum(list2)" (if (= (length list1) (length list2)) (loop for val1 in list1 and val2 in list2 sum (* val1 val2) into num sum val2 into den finally (return (/ num den...