6.5. IDA Constants
Below we list all input and output constants used by the main solver and linear solver modules, together with their numerical values and a short description of their meaning.
6.5.1. IDA input constants
Constant 
Value 
Description 


1 
Solver returns at specified output time. 

2 
Solver returns after each successful step. 

1 
Compute \(y_a\) and \(\dot{y}_d\), given \(y_d\). 

2 
Compute \(y\), given \(\dot{y}\). 

0 
No preconditioning 

1 
Preconditioning on the left only. 

1 
Use modified GramSchmidt procedure. 

2 
Use classical GramSchmidt procedure. 
6.5.2. IDA output constants
Constant 
Value 
Description 


0 
Successful function return. 

1 


2 


99 


1 
The solver took 

2 
The solver could not satisfy the accuracy demanded by the user for some internal step. 

3 
Error test failures occurred too many times during one internal time step or minimum step size was reached. 

4 
Convergence test failures occurred too many times during one internal time step or minimum step size was reached. 

5 
The linear solver’s initialization function failed. 

6 
The linear solver’s setup function failed in an unrecoverable manner. 

7 
The linear solver’s solve function failed in an unrecoverable manner. 

8 
The userprovided residual function failed in an unrecoverable manner. 

9 
The userprovided residual function repeatedly returned a recoverable error flag, but the solver was unable to recover. 

10 
The rootfinding function failed in an unrecoverable manner. 

11 
The inequality constraints were violated and the solver was unable to recover. 

12 
The userprovided residual function failed recoverably on the first call. 

13 
The line search failed. 

14 
The residual function, linear solver setup function, or linear solver solve function had a recoverable failure, but 

15 
The nonlinear solver’s init routine failed. 

16 
The nonlinear solver’s setup routine failed. 

20 
The 

21 
A memory allocation failed. 

22 
One of the function inputs is illegal. 

23 
The IDA memory was not allocated by a call to 

24 
Zero value of some error weight component. 

25 
The \(k\)th derivative is not available. 

26 
The time \(t\) is outside the last step taken. 

27 
The vector argument where derivative should be stored is 

0 
Successful function return. 

1 
The 

2 
The IDALS linear solver has not been initialized. 

3 
The IDALS solver is not compatible with the current 

4 
A memory allocation request failed. 

5 
The preconditioner module has not been initialized. 

6 
The Jacobian function failed in an unrecoverable manner. 

7 
The Jacobian function had a recoverable error. 

8 
An error occurred with the current 

9 
An error occurred with the current 