Help: how do i get Creo to allow negative values

Your syntax is correct.  The dollar sign does get placed in front of the dimension name.  More than likely the value is not be valid, regardless of the fact that it is negative.  What happens if you remove the relation and manually try setting D22 to -0.875425 deg.  Does it fail?

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@dramirez wrote:

Am I not understnding the syntax for allowing negative values?

I get the following error

 

d22=asin(1.4607*sin(d21))

errorInvalid attempt to assign negative value -0.875425deg to 'D22'. Precede the symbol with '$' to allow negative value.

 

but after adding $, I get the following error

$d22=asin(1.4607*sin(d21))

errorInvalid left side of assignment

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Hi,

1.] http://support.ptc.com/help/creo/creo_pma/usascii/index.html#page/part_modeling/part_modeling/part_five_sub/About_Editing_Dimensions.html 

set show_dim_sign yes

2.] http://support.ptc.com/help/creo/creo_pma/usascii/index.html#page/fundamentals/fundamentals/fund_seven_sub/Negative_Dimensions_in_Relations.html 

use notation $dimensionname in relations