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Help: how do i get Creo to allow negative values

dramirez
3-Visitor

Help: how do i get Creo to allow negative values

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

5 REPLIES 5
TomU
23-Emerald IV
(To:dramirez)

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?

dramirez
3-Visitor
(To:TomU)

$d22=-.875

Still give the l'invalid left sided of assignment' error

 

d22 is the angle between a sketch curve and the datum.

Doess Creo therefore only allow values between 0 and 360?

 

I may have to figure out an if statement to convert the angle to a positive value between 0 and 360 

I think you just put in the negative value... and let the dimension respond to it.

it looks like 0-360 i the limit for angles.

So I went with the following, which seems to work.

 

/* CORRECT SIGN CHANGES
/* d22=asin(1.4607*sin(d21))
ang4=asin(1.4607*sin(d21))
If ang4 < 0
d22 = 360+ang4
else
d22 = abs(ang4)
endif

 


@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


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

 


Martin Hanák
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