Recent content by Antonija

Homework Statement The negative H− ion is a two-electron system like the He atom. How large is the binding energy of the second electron?Homework Equations For hydrogen-like atoms we can use hydrogen wavefunctions so I did it here. First there is potential to be found and then, multipled...

Thank you very much, I had been struggling with this a 3 days non-stop...I reinitialized counter i, to 1. it's initialized at one at the beggining. That's not the whole code, it's just a part of it. Well, I think i solve it now because there is no more errors! :) Just, I used pointers. It was...

Homework Statement I'm doing aproximation of derivative called five-point stencil. For every value of x, in interval [a,b], in step of 0.1 i need to calculate derivative.Homework Equations [/B] The equation is like this: Five-point stencil: (-f(x + 2h) + 8f(x + h) - 8f(x - h) + f(x -...

Thank you very much! Firstly I declared it as dimension 100, for example but if I have 20 numbers to put there then I will get more 80 numbers which should't be there, I suposse fortran put them there from somewhere in the memory... But than I allocated it and it works. Just one thing, i think...

If I put avaluate(x) I get the error. There are used modules and many subroutines. I got the routine online, someone shared it and gave instructions which parts I should change in order to use it in my code... And, my code is here. This is the first version which works but doesn't store the...

Homework Statement My program calculates the value of a function. Then it prints them on the screen. This is the part: do while(x<=b) variablesvalues(1)=x x=x+delta call recog_variables (func, variables) answer=evaluate(variablesvalues) print*, answer end do What I need to do now is to save...

Actually, at the moment I'm not sure if I have fortran 90 or fortran 95, because my linux crashed a month ago and then I had to build everything new... However, I tried it with do while loop and it worked... It's like this: real:: a, x, delta= 0.0001 do while(x<=a) x=x+delta call [function] ...

Homework Statement I'm trying to find out is it possible to make a real do loop in fortran. As I read online, it's possible, and there is written how to do it but when I copy/paste it into my fortran editor, it' doesn't work. At the moment I'm writing the code for minimize a function of a...

I did it well! :) I don't know if I can put it here, so everyone who might need a help can see it, because I didn't do it myself, I just copy/paste some finished code which I found online (I'm sure I did it legally) and I modified it to fit into my original code... I'm just a begginer in...

I'm sorry, now I see it looks bad, on my post. I'm going to try to work it out somehow and then I will post again...

Homework Statement How can I evaluate function in some point of x? So, user inputs function in a character string, and he inputs the value of x. The program then needs to evaluate f(x). I have read something like this:http://faculty.cs.niu.edu/~hutchins/csci230/arith.htm But, I'd like to see...

It' doesn't work... :( I tryed it this way, and it's the same, it just counts until the first space or comma. do i=len(interval),1,-1 if (interval(i:i).ne. ' ') then length=length+1 end if end do

One more thing, don't know what to try anymore, I need to count the number of particles in array, tryed with len_trim, with do loop,if,case... everything gives the same result: it counts the particles until the first space or first comma. I need it to count even when it comes to space, but add 0...

Thanks. Generally I don't need to use allocation, but I want to, because I need to show skills as much as I can in my program, even if it's not that neccessary... so, it may be something like this:print*,'input the interval' read(*,*)interval allocate(character(len(interval))::interval...

Homework Statement I have character array in fortran which is defined as allocatable. When program runs, user inputs something like: [1,2,3,4...], and then program reads it and counts the particles, and then allocate array with dimension it just read. Thats' how I understood it. This program...