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differentiate tan and tanh in safe way without cos and cosh

pre-master-46
dwarning 8 years ago
committed by Holger Vogt
parent
f33c3f0751
commit
3dd94ba15c
1 changed files with 6 additions and 6 deletions
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  1. 12
      src/spicelib/parser/inpptree.c

12
src/spicelib/parser/inpptree.c
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@ -461,16 +461,16 @@ static INPparseNode *PTdifferentiate(INPparseNode * p, int varnum)
p->left)));
break;
case PTF_TAN: /* 1 / (cos(u) ^ 2) */
arg1 = mkb(PT_DIVIDE, mkcon(1.0), mkb(PT_POWER,
mkf(PTF_COS,
case PTF_TAN: /* 1 + (tan(u) ^ 2) */
arg1 = mkb(PT_PLUS, mkcon(1.0), mkb(PT_POWER,
mkf(PTF_TAN,
p->left),
mkcon(2.0)));
break;
case PTF_TANH: /* 1 / (cosh(u) ^ 2) */
arg1 = mkb(PT_DIVIDE, mkcon(1.0), mkb(PT_POWER,
mkf(PTF_COSH,
case PTF_TANH: /* 1 - (tanh(u) ^ 2) */
arg1 = mkb(PT_MINUS, mkcon(1.0), mkb(PT_POWER,
mkf(PTF_TANH,
p->left),
mkcon(2.0)));
break;

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