Cannot understand an "unintelligible error"

[Roshni Uppala]

I am running a simple circuit with a source and a memristor and a resistor. Apparently, Xyce is giving an error related to the memristor subcircuit. I cannot seem to understand these particular errors.

User error: Unintelligible syntax in:  EXP(-{ALPHAP}*(X - XP))* ((XP-X)/(1-XP)
 +1) *STP(X-XP) + STP(XP-X)
User error: Unintelligible syntax in:  EXP(-{ALPHAP}*(X - XP))* ((XP-X)/(1-XP)
 +1) *STP(X-XP) + STP(XP-X)
User error: Unintelligible syntax in:  EXP(-{ALPHAP}*(X - XP))* ((XP-X)/(1-XP)
 +1) *STP(X-XP) + STP(XP-X)

My code is :

 
EG dx 0 value={Ap*(exp(V(Plus, Minus)) - exp(Vp))* winYP(V(x), Xp, Xn)*stp(V(Plus, Minus)-Vp) -An*(exp(-V(Plus, Minus)) - exp(Vn))* winYN(V(X), Xp, Xn)*stp(-V(Plus, Minus)-Vn)}


Thank you

[xyce-users]

You have not provided sufficient information for us to diagnose the problem completely, but the presence of curly braces in the error message above suggests you have an error in one of your function definitions.  You cannot nest curly braces, and this error message suggests that perhaps you are.  But it is impossible to tell because you have not provided enough context.

In the future, please provide more than one line of netlist and a set of error messages.  The exact netlist that can actually be run to reproduce the problem is pretty much the minimum information we need to answer questions like this.

[Roshni Uppala]

Oh, sorry about that. I have attached the netlist and error message with this email.

I think the problem is because I am using "stp" and "idt" functions which worked with ltspice?

I really appreciate your help. Thanks

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[xyce-users]

On Monday, July 14, 2014 3:14:30 PM UTC-6, Roshni Uppala wrote:

Oh, sorry about that. I have attached the netlist and error message with this email.

I think the problem is because I am using "stp" and "idt" functions which worked with ltspice?

stp is a recognized function in Xyce, but idt is not.  Please consult the reference guide for the complete documentation of what functions are supported in Xyce's expression library.

But the "Unintelligible error" issue is indeed due to what we speculated:  you have used curly braces inside other curly braces in the definition of winYP.  Remove the curly braces around "alphaP" and the unintelligible syntax error goes away.

Curly braces delimit top-level expressions.  Not only is it unnecessary to enclose subexpressions within an expression in curly braces, it is illegal.  The subcircuit parameter inside the winYP function is just a variable that has to be resolved by the expression parsing package, and it should not have curly braces around it.
 

I really appreciate your help. Thanks

[Roshni Uppala]

Ok. got it thank you !