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if normalize-vector takes zero vector, return zero vector instead of nan vector #277

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if normalize-vector takes zero vector, return zero vector instead of nan vector #277

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3 changes: 3 additions & 0 deletions lisp/c/matrix.c
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Original file line number Diff line number Diff line change
Expand Up @@ -308,6 +308,9 @@ register pointer argv[];
for (i=0; i<s; i++) sum+= a[i]*a[i];
sum=sqrt(sum);
for (i=0; i<s; i++) r[i]=a[i]/sum;
int all_nan=1; /* if all element is nan, return 0 vector */
for (i=0; i<s; i++) if (!isnan(r[i])) all_nan=0; // false
if (all_nan) for (i=0; i<s; i++) r[i]=0;
return(result);}

pointer VDISTANCE(ctx,n,argv)
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