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Whilst playing around with a Newton-Raphson solver for a simultaneous set of functions, I noted a disparity between the Mathcad 15 and Mathcad Prime 7 results for the Jacobian of one set of functions. To eliminate the possibility of other parts of the worksheet contaminating the environment, I copied the function to a blank worksheet. Unfortunately, I get the same results.
Why is the derivative d/dξ for just cos(x₀) yet isn't when multiplied by x₀??
Mathcad 15 returns the result I expect.
Stuart
Solved! Go to Solution.
Reason for not working when I simply evaluated the regions after switching to the legacy symbolic was that I also must evaluate the definition of G(x) from anew. Not sure why.
Here are some other observations - and yes, I'd call i a bug.
"New" symbolic:
Legacy symbolic
Guess you ran into Primes infamous autolabeling bug.
Check the labels of all xi and set them manually to "variable".
EDIT: No, autolabeling seems not to be the cause here even though I experienced strange effects in P6 when I retyped your expressions, then copied them, switches to the legacy engine, selected the symbolically evaluated regions and pressed F9. Can't explain the error message in the first one
When I copy the expressions AFTER having switched to the legacy engine, I get
@Werner_E wrote:
Guess you ran into Primes infamous autolabeling bug.
Check the labels of all xi and set them manually to "variable".
EDIT: No, autolabeling seems not to be the cause
Yes, I thought of that when I first hit the problem (https://community.ptc.com/t5/PTC-Mathcad/Newton-Raphson-method/m-p/771992/highlight/true#M199247). However, it was way past my bedtime and I thought sleep deprivation was stopping me from seeing the obvious. Maybe it wasn't ...
EDIT: No, autolabeling seems not to be the cause here even though I experienced strange effects in P6 when I retyped your expressions, then copied them, switches to the legacy engine, selected the symbolically evaluated regions and pressed F9. Can't explain the error message in the first one
When I copy the expressions AFTER having switched to the legacy engine, I get
Stuart
Reason for not working when I simply evaluated the regions after switching to the legacy symbolic was that I also must evaluate the definition of G(x) from anew. Not sure why.
Here are some other observations - and yes, I'd call i a bug.
"New" symbolic:
Legacy symbolic
@Werner_E wrote:
Reason for not working when I simply evaluated the regions after switching to the legacy symbolic was that I also must evaluate the definition of G(x) from anew. Not sure why.
Here are some other observations - and yes, I'd call i a bug.
"New" symbolic:
Good stuff, Werner. Let us hope some kindly PTC/Subscription individual makes it known to the Symbolic team.
Stuart
I decided to be kind and I let them know by linking to this thread.