Newton-Raphson Method Error

I have an error in the following exercise, which I don't know why it happens. If you could help me I would be very grateful. The exercise is as follows:

My code corresponds to:

And the error that appears to me is the following:

I don't understand why the iteration limit is wrong.

[Pauli Huusari]

Hi,

for me it seems that the row 15 in the function definition rfNewtonR is never reached, since the row 9 executes the command return when the for-looper i is equal to itmax. Executing the command return exits the function immediately. Therefore, the error message Iteration Limit Exceeded is not displayed/ thrown.

My suggestion is to remove the rows 8 - 10 in the function definition rfNewtonR. Then the row 15 is executed after the for-loop.

Best regards, Pauli Huusari

Answer 1

[Pauli Huusari]

Hi,

for me it seems that the row 15 in the function definition rfNewtonR is never reached, since the row 9 executes the command return when the for-looper i is equal to itmax. Executing the command return exits the function immediately. Therefore, the error message Iteration Limit Exceeded is not displayed/ thrown.

My suggestion is to remove the rows 8 - 10 in the function definition rfNewtonR. Then the row 15 is executed after the for-loop.

Best regards, Pauli Huusari

[Dyuman Joshi]

"My suggestion is to remove the rows 8 - 10 in the function definition rfNewtonR."

They can not be removed as they follow the latter part of point #2 mentioned in the problem statement.

However, as per on point #3 - OP needs to modify the 1st if statment (i.e. lines 8-10) to include the error message. Then the code would be inline with the problem.