Question to: Infinite or Not-a-Number value encountered
1 view (last 30 days)
Show older comments
Karsten Gros on 8 Jan 2017
Commented: Karsten Gros on 10 Jan 2017
Hi, I have a question regarding my matlab-code. Basically, the code should calculate the heat-transfer for drop-wise condensation. At first, the program worked just fine, but I received a unexpected solution, so I searched for mistakes. At line 64, I noticed that I wrote a / instead of * (kJ to J is obviously *1000 not /1000 ;) ) So after I corrected that mistake, the Warning: "Infinite or Not-a-Number value encountered" occurred (at the matlab-function integral, line 106 to 108). I attached the file, so if anyone is willing to help me, you would make me very happy :) I guess the problem is, that at line 64, h_fg gets too big (from /1000 to *1000, so factor 10^6), any ideas how I could get the program fixed? Thanks in advance and best regards, Karsten
Jordan Ross on 10 Jan 2017
This is a result of your function have a discontinuity and trying to integrate between points where the discontinuity exists. If you plot the function "start" you will see that the function is undefined around R = 0 and R = -2.
>> figure; fplot(start);
Furthermore, if you try and evaluate the function "start" at R=R_stern you will get that the value is "NaN" leading to the integral giving you this error.
More Answers (0)
Find more on Programming Utilities in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!Start Hunting!