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POMacro doesn't work in the function
 

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  1. POMacro doesn't work in the function
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    <p>I have problems with following code: <a href="http://lisper.ru/apps/format/96" rel="nofollow noreferrer">http://lisper.ru/apps/format/96</a></p> <p>The problem is in "normalize" function, which does not work.<br> It fails on the fifth line: <code>(zero-p a indexes i)</code></p> <pre><code>(defun normalize (a &amp;optional indexes i) "Returns normalized A." (progn (format t "Data=~A ~A ~A" a indexes i) (if (zero-p a indexes i) a ;; cannot normalize empty vector (let* ((mmm (format t "Zero?=~a" (zero-p a indexes i))) (L (sqrt (+ (do-op-on * a :x a :x indexes i indexes i) (do-op-on * a :y a :y indexes i indexes i) (do-op-on * a :z a :z indexes i indexes i)))) (mmm (format t "L=~a" L)) (L (/ 1D0 L)) (mmm (format t "L=~a" L))) ; L=1/length(A) (make-V3 (* (ref-of a :x indexes i) l) (* (ref-of a :y indexes i) l) (* (ref-of a :z indexes i) l)))))) </code></pre> <p>in function "normalize" I call the macro "zero-p", which in turn calls macro "ref-of", which is the last in the chain.</p> <pre><code>(defmacro zero-p (v &amp;optional indexes index) "Checks if the vector is 'almost' zero length." `(and (&lt; (ref-of ,v :x ,indexes ,index) *min+*) (&lt; (ref-of ,v :y ,indexes ,index) *min+*) (&lt; (ref-of ,v :z ,indexes ,index) *min+*) (&gt; (ref-of ,v :x ,indexes ,index) *min-*) (&gt; (ref-of ,v :y ,indexes ,index) *min-*) (&gt; (ref-of ,v :z ,indexes ,index) *min-*))) </code></pre> <p>Here is ref-of:</p> <pre><code>(defmacro ref-of (values coordinate &amp;optional indexes index) "Please see DATA STRUCTURE for details." (if indexes (cond ((eq coordinate :x) `(aref ,values (aref ,indexes ,index))) ((eq coordinate :y) `(aref ,values (+ 1 (aref ,indexes ,index)))) ((eq coordinate :z) `(aref ,values (+ 2 (aref ,indexes ,index)))) (T (error "The symbol ~S is not :X, :Y or :Z." coordinate))) (cond ((eq coordinate :x) `(aref ,values 0)) ((eq coordinate :y) `(aref ,values 1)) ((eq coordinate :z) `(aref ,values 2)) (T (error "The symbol ~S is not :X, :Y or :Z." coordinate))))) </code></pre> <p>Also, in "normalize" I call the macro "do-op-on", which calls "ref-of" as well.</p> <pre><code>(defmacro do-op-on (op name1 coord1 name2 coord2 &amp;optional is1 i1 is2 i2) "Example: (do-op-on * A :x B :y i n) == A[i[n]].x*B.y" `(,op (ref-of ,name1 ,coord1 ,is1 ,i1) (ref-of ,name2 ,coord2 ,is2 ,i2))) </code></pre> <p>As a result, instead of having this: <code>(aref some-array 0)</code> I have <code>(aref NIL NIL)</code> which is created in "ref-of".</p> <p>I suppose that I lose the symbol A from the call <code>(normalize A)</code>. I just feel that the symbol does not survive the macroexpanson. The thing is, macroexpansoin works in REPL for each macro independently.</p> <p>Can anyone explain where is the mistake?</p>
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    1. USavp
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    1. COCan you be more descriptive than "does not work"? Which macro is it that doesn't work? Imagine you are a bug reporter.
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      1. POMacro doesn't work in the function
      1. UScharlieb
    2. COThanks for feedback! I clarified the question.
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      1. USavp
    3. COWhat language (Common Lisp?) and implementation are you using?
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      1. POMacro doesn't work in the function
      1. USChris Johnsen
 

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