Getting an error "Error using erfc... Input must be real and full"
18 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
This code is giving the error msg "Error using erfc... Input must be real and full"
Here PR = 0.71 so "a" will be neagtive.
a=M/(PR-1)
exp(-y*sqrt(a*PR)).*erfc(eta*sqrt(PR)-sqrt(a*t))+exp(y*sqrt(a*PR)).*erfc(eta*sqrt(PR)+sqrt(a*t))
How to rectify this problem?
0 Kommentare
Antworten (2)
Walter Roberson
am 24 Mär. 2023
Bearbeitet: Walter Roberson
am 24 Mär. 2023
if a is negative and t is positive then sqrt(a*t) is square root of a negative value which is imaginary. You end up taking erfc of a complex value.
If you really need erfc of a complex value see https://www.mathworks.com/matlabcentral/answers/7153-erfc-with-complex-number#answer_9795
0 Kommentare
Dyuman Joshi
am 24 Mär. 2023
Bearbeitet: Dyuman Joshi
am 24 Mär. 2023
The function erfc only supports real inputs (as evident by the error) and the input to erfc here is complex.
You can either use the symbolic erfc function, which requires Symbolic Math Toolbox. Note that you need to pass the input as symbolic number or symbolic variable.
Or you can use FEX file submissions -
0 Kommentare
Siehe auch
Kategorien
Mehr zu Symbolic Math Toolbox finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!