Timeline for Evaluation of an Error function [duplicate]
Current License: CC BY-SA 4.0
7 events
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| Sep 29, 2020 at 12:30 | history | closed |
Michael E2 m_goldberg Dunlop MarcoB AsukaMinato |
Duplicate of General::ivar is not a valid variable when plotting - what actually causes this and how to avoid it? | |
| Sep 23, 2020 at 15:55 | review | Close votes | |||
| Sep 29, 2020 at 12:30 | |||||
| May 15, 2019 at 7:50 | comment | added | Roman |
Please read this tutorial on how to differentiate := and =. It will help you in other contexts too.
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| May 15, 2019 at 5:34 | answer | added | Carl Woll | timeline score: 1 | |
| May 15, 2019 at 4:21 | comment | added | Emad Raslan | It works for this sample, but it does not twork for more complicated code which contains many functions. | |
| May 15, 2019 at 3:55 | comment | added | Bill |
:= says to evaluate the right hand side later when the function is called. Next df[1,2,0.2,0.3] sets x equal to 1 and y equal to 2. Next evaluate the right hand side doing D[f[1,2],1] and you don't know how to differentiate with respect to 1. Same for 2. If you change the := to = in your definition of the df function and you clear all definitions or restart Mathematica then the right hand side is evaluated before df[1,2..2,.3] and the error message goes away. But you must be very careful with this to be certain that the answer is correct.
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| May 15, 2019 at 3:20 | history | asked | Emad Raslan | CC BY-SA 4.0 |