Global boolean variables

Hi,

Mathcad takes a first pass through the worksheet.  Global variables are created in this pass.

A second pass through the worksheet creates other variables.

In the first pass global variable TR is created but it has as part of definition a normal variable ZIP that won't be created until the second pass.

Mathcad throws an error

Cheers

Terry

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I want to defeat the top-down, left-right programming in the sheet. 

 

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Why??

What would/should be the benefit of the global assignment?

A global assignment can only use constants or other globally assigned variables or functions. A global assignment CAN NOT USE variables which are defined using the normal assignment operator := even if the variable is defined in front of it.
Thats the reason for the error your got.

Terry tried to explain the reason for this behaviour. The sheet is first read by Prime from top down  only looking for global assignments. Normal assignments are ignored in this first pass (hence the error). Then in the second pass the normal assignments are considered and stored. That way its possible that a variable which is globally assigned can be used even in front of its actual definition.

To make your approach with the global assignment work you would have to also globally assign the variables Z1P, etc. which are used in the definition of TR. Not sure what the benefit of doing so would be, though.