I've written a function C with 2 inputs: a scalar and a vector; and 1 output: a vector. When I evaluate the function for a certain input there is no problem. However, when I try to compute the Jacobian of the function I get the following error: "The array index is invalid. The index must be an integer, not less than ORIGIN, and not greater than the last element."
Strangely, when I get rid of the two bottom entries of the output vector of the function C, I get no such error, it produces the Jacobian matrix one would expect it to. This leads me to believe that the issue is in q_3. (I have made sure that 3 is no subscript but an index)
Can anyone tell me what the issue here is?
1 ACCEPTED SOLUTION
Accepted Solutions
Yes, the worksheet would help. Some definitions are obviously done but not visible in the snippet picture.
Remember: Some errors thrown are not what they seem to be.
From scratch, when I test around with Mathcad Prime 7 (attached), I realize a similar error like in the above picture (index) but caused by a missing definition of q when Jacob() gets called.
Remember:
Definition like F(x):= works, even if x is undefined
Call of a function like F(x)= fails if x is undefined
Please test if the above is the case in your example:
When Jacob function is getting called, and q is not defined, then Mathcad Prime cannot work and mus throw an error.
Test: put a definition of q right prior the call of Jacob() function. Like in this example (first call of Jacob() fails, second works):
Note: of course the values must differ in my example, missing your origin example.
Yes, the worksheet would help. Some definitions are obviously done but not visible in the snippet picture.
Remember: Some errors thrown are not what they seem to be.
From scratch, when I test around with Mathcad Prime 7 (attached), I realize a similar error like in the above picture (index) but caused by a missing definition of q when Jacob() gets called.
Remember:
Definition like F(x):= works, even if x is undefined
Call of a function like F(x)= fails if x is undefined
Please test if the above is the case in your example:
When Jacob function is getting called, and q is not defined, then Mathcad Prime cannot work and mus throw an error.
Test: put a definition of q right prior the call of Jacob() function. Like in this example (first call of Jacob() fails, second works):
Note: of course the values must differ in my example, missing your origin example.
