How to demonstrate programming knowledge in CV, while applying to academia and industry? I'm currently looking for both postdoc position(preferred) and industrial position in areas where I'd need to do programming in the language(s) my lab/company will need me to. The academic areas I'm looking for are computer vision, computational neuroscience etc. 

However, my Ph.D. was in pure mathematics and I didn't write a single piece of code. In my current postdoc, I'm programming but so far don't have a published result that clearly demonstrates my coding skills (in matlab). Given this situation, how can I best demonstrate my coding skills in my CV? I mean, evryone will write: "Programming languages known: a,b,c" etc. But I'm not sure (I might be wrong) that's enough? So how could I best demonstrate that I know decent matlab and I can build algorithm?

One idea that's occurring to me is to make a paragraph named "programming experience" after "programming languages known", saying for example, "I numerically solved the differential equation (*) in this language: code available upon request". 

I'd appreciate your opinion, thank you!
I would recommend not trying to use the same document to apply to qualitatively different positions.  Typically, companies do not want a CV, they want a resume.  Prepare a resume following industry standards, which includes your skills, programming languages, etc., and use that for your industry applications, while you use your CV to apply for postdocs.