error in imshow and alpha

I have been plotting my data by using "imshow" with "alpha" to make some objects to be more transparent. Everything has been working good. Never encountered problems before.

Like 10 minutes ago, when I processed and tried to plot my data. I got the error message like below:

"

Not enough input arguments.

Error in alpha (line 19)

alph = 1 + (z/d).^2 + Ax*(z/d).^3 + Bx*(z/d).^4;

"

I used this code the entire evening. Everything was good, but this error all of sudden started 10 minutes ago. The error persists in different PCs different MATLAB versions (2020b, 2021a) and different importing data.

Not sure what happened.

Answer 1

[DGM]

I'm going to go out on a limb here and suggest that you likely have another function file called alpha.m somewhere on the path. The file for alpha() which would be used for setting graphics object transparency has a large enough synopsis that it wouldn't have any sort of code on line 19.

You can check to see if there are conflicting files by using which():

which alpha -all

If there's an unintended alpha.m on the path, either rename it or move it off the path.

If my guess is mistaken, then I'm going to have to ask if you can you provide an example of the code which replicates the problem?

[Yen-Cheng Chen]

Thank you for the suggestions! I checked the path and found there's another alpha.m in the path, and when I removed it, everything works well again. My bad! I totally missed it.

[Image Analyst]

Then please go ahead and click the "Accept this answer" link to award @DGM "reputation points" for helping you, and let people know it's now solved. Thanks in advance. 🙂

Answer 2

[Image Analyst]

What is the size of the Ax, Bx, z, and d variables? try taking it one term at a time

clc
size(Ax)
size(Bx)
size(z)
size(d)
term1 = (z/d) .^ 2
term2 = Ax * (z/d) .^ 3
term3 = Bx * (z/d) .^ 4
alph = 1 + term1 + term2 + term3

Let me know where it bombs, and everything you see in the command window.

Also, let us know how alpha and alph are related. "alph" is obviously a variable, but where do you declare or mention alpha?

[Yen-Cheng Chen]

I imported another other codes and it happened to have another alpha.m in the path. When I removed it, everything works well again.