Expression looks perfect! What's my problem?

[kronique]

//R Wing fold
 
if ((bn_R_arm01 >=0  && bn_R_elbow01 =< 0 ) || (bn_R_arm01 =< 35.71 && bn_R_elbow01 >= -85.082))
		cls_r_wingfold01.envelope = 1; 
else
		cls_r_wingfold01.envelope = 0;

my characters are all case-sensitive, and syntax is correct.   fyi "cls_r_wingfold01" is a cluster. I have looked for more on using clusters in expressions but i'm not able to find much which makes me wonder if the attribute is labeled incorrectly. Can anyone let me know?

[pilou--2]

you can't write : 

cls_r_wingfold01.enveloppe = 0;

the proper syntax is :

setAttr "cls_r_wingfold01.enveloppe"  0;

[joojaa]

Pilou, its an expression so

cls_r_wingfold01.envelope = 0;

Is right syntax allright . Its just that its impossible to know why it fails because theres no context to see what attributes he really ahs and what the right naming conventioun would be.

[pilou--2]

Oh that's right. My bad.

Second thought : bn_R_arm01  doesn't miss his .attr ? so you get bn_R_arm01.attr >= 0 ...

[joojaa]

Second thought : bn_R_arm01  doesn't miss his .attr ?

Yes