nim | minimal command-line based contents generator

From language lawyer's point of view an UB happens here:

Default arguments can be passed to macro, but for blocks it does not seem particularly pretty:

getContents returns not a String as you apparently expect, but IO String, which is a "program", which, when executed, will produce a String. So when you're trying to parse this program with decode, of course that doesn't work: decode parses a String, it cannot parse a program.

So how do you execute this program to obtain the String? There are two ways: either you make it part of another program or you call it main and it becomes your entry point.

In your case, the sensible thing to do would be to make getContent part of your main program. To do that, use the left arrow <-, like this:

You might want to try and run nim c -d:release --genScript try1.nim. This will generate a compile_try1 script in the nimcache folder that should be able to compile the C sources generated by Nim.

So if I understand your problem correctly, given input

Your output from model.predict_proba() is a matrix with 2 columns, one for each class. To calculate roc, you need to provide the probability of the positive class:

Using an example dataset:

As I assume that you did your first test with a tiny Nim program, maybe providing that few lines of code would have not really heart. Well and your Linux distro version and your Nim version would be interesting too, Nim 0.11 way not work that well today :-)

As Nim is a compiled language, it is generally a good idea to separate the compile proces and the program executation process is cases of problems, so that it is obvious if it is a compile error or a runtime error. Your call nim c --run hello.nim would compile and run the program. A plain nim c hello.nim would compile only, so it is absolutely clear that it is compile error. (Indeed in your cases it seems to be obvious that the compile step is the problem, but I have seen issues where it was not so clear...)

But for your actual issue, I have seen such error messages for a few people, and the cause was a problem with the actual linux distro and the way that distro has installed the C compiler incomplete, I think build-essentials was missing. For details see this Nim forum thread

https://forum.nim-lang.org/t/6571

When you can find the actual reason for the issue and it was not your own fault, then you may report it to your distro or maybe even to the Nim github issue tracker, so that such problems can be avoided for newcommers in the future.

And when all works, you are a beginner and want to learn Nim, maybe read

http://ssalewski.de/nimprogramming.html

or some of the other tutorials.

This happens because you are trying to put your data into the SQL command without quotation marks around it. The immediate issue can be solved by writing "{x}" instead of {x}.

However, doing it this way is a terrible idea, because it's an SQL injection waiting to happen. To solve this, you don't put the data that you're trying to insert into your database right in the query string, instead you use query parameters:

As far as I can see, namax, namin and reata_akhir all use dthms[i].akhir for calculation. However, dthms[i].akhir is only calculated in procedure output and that procedure is only called by selecting "2" in the main menu. Probably you should consider a change of that fact.

There is also another error, I think. In procedure output you are also calculating a grade. This is not a personal variable (not part of the mhs record) but a single common value. Meaning that all "students" (I presume) will have the grade of the last student in the output table