Learning C, can anyone help me out?

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Learning C, can anyone help me out?
  1. Unread #1 - Mar 6, 2013 at 6:32 PM
  2. BoredDanMan
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    Learning C, can anyone help me out?
    First I'd like to say that I had an old account on Sythe long ago when I was into runescape and botting and all that jazz, but now that I've gotten older and am not really playing runescape anymore, I remembered that Sythe also had a section on the forums for programming. I'm getting into programming, and I figured the first language I should learn is probably C. I'm now trying to make a code that will do the following things, but I don't really know where to start.

    1). Accept some form of user input whether it's from a file or typed in for 10 ordered pairs (x and y variables, both float). At the moment i just have two arrays, one for x and one for y.

    2). Use simple linear regression to calculate the best fit line for the given points

    3). print the best fit line and r value

    Note I have never actually taken statistics so I'm using my calc knowledge and wikipedia to understand how Linear Regression works. Finding the r value seems annoying and I dont really get it.



    Update: I've figured it out except for a small problem. When doing the linear regression with certain data sets there is a divide by 0 error and I cant seem to fix it
     
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  3. Unread #2 - Mar 10, 2013 at 3:24 AM
  4. Blupig
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    Learning C, can anyone help me out?
    It's not really related to your question, but you probably shouldn't be doing C for your first language
     
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  5. Unread #3 - Mar 11, 2013 at 3:37 AM
  6. Sythe
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    Learning C, can anyone help me out?
    There are about a thousand ways you can do this. Here is a simple one:

    Code:
    #include <stdio.h>

int main(int argc, char** argv) {

	float x[10], y[10];

	for (int i = 0; i < 10; i++) {

		if (scanf("%f %f\n", &(x[i]), &(y[i])) != 2) {
			printf("Could not parse line. Expecting 0.001 0.002 for example\n");
			break;
		}

	}

	for (int i = 0; i < 10; i++) printf("%d: %f, %f\n", i, x[i], y[i]);

}
    Sounds like your homework. Won't be writing that code for you. But linear regression is pretty straight forward I think you can figure it out.

    If you are writing plain ansi C you wont be able to print a graph. You will need a library.

    Use a debugger such a gdb to find the bug. Then add something like if (x == 0) break;

    C is an excellent first language because it will teach you all the core and most important concepts in programming. It is just difficult to learn.
     
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  7. Unread #4 - Mar 11, 2013 at 5:26 PM
  8. Govind
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    Learning C, can anyone help me out?
    Other than objects.
     
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  9. Unread #5 - Mar 11, 2013 at 10:30 PM
  10. Sythe
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    Learning C, can anyone help me out?
    Not true. C has structs.

    Every essential programming concept is in C. Remember that OO gets compiled down to procedural assembly at the end of the day -- It's just a way of organizing your code for maximum reuse and maintainability.

    In terms of programming a computer (as in a physical CPU) C gives you everything you need both concept-wise and in practical terms.

    Of course I am slightly biased, I've tutored C for almost half a decade.
     
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  11. Unread #6 - Mar 11, 2013 at 10:41 PM
  12. SuF
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    Learning C, can anyone help me out?
    Structs only give you half the picture. OOP is the most predominant paradigm in programming today and I think it's a lot easier to go from an OOP background and then learn C then go from C to OOP but I'm most likely bias because I started with and have kept with Java. I will say that functional programming is most certainly not something you should learn first. Recursion is damn hard to wrap your mind around when you first start it.
     
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  13. Unread #7 - Mar 12, 2013 at 3:00 PM
  14. Blupig
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    Learning C, can anyone help me out?
    Don't get me wrong it's a great language, but the reason I wouldn't recommend it as a first to learn is because it can get pretty discouraging. I took a couple C++ classes last year and it was a breeze for me since I've been programming for years, but for those who were starting out, they had a lot of trouble and were completely turned off from programming after the end of the first semester.

    I feel that programming is something that should be eased into, with a high-level common syntax language like C# or Java. With those you still learn your syntax, your logic, and gain the ability to think "in code". Afterwards, learning C would be infinitely easier and most likely would be more fun (not to mention at that point, after learning a high-level language, the user would notice the benefits of a lower-level language). Idk, just my 2 cents. I think it's a lot easier to go from high-level to low-level as opposed to the opposite.

    EDIT: Just realized that SuF and I are on the same ground here. I could also be bias, seeing as I started with VB6 -> VB.NET -> Java -> C# -> C++
     
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