Array with Fibonacci numbers

[calavan11]

I am trying to construct a VI with one numeric input n that builds the array containing n Fibonacci number, beginning with F1.  The Fibonacci number is not defined for 0 or negative numbers.I need to  make sure that the user is not able to enter any number less than one.  And the output display should be a 2D array having a column for the values of "n" and a column for the corresponding Fibonacci number. (i.e., not two 1D arrays).

I know that a fibonacci numbers are the sequence of numbers, denoted by Fn.  Defined by the relation Fn=F(n-2) + F(n-1) with F1 =1 and F2 =1.

The following table shows the values of Fn that i need to obtain for the first few values of n (all inputs are positive values).

n       Fn

1        1

2        1

3        2

4        3

5        5

6        8

7       13

8       21

9       34

10     55

I am not sure where to even start, I'm probably making this harder than it needs to be.  If anyone could help that would be great

Many thanks

[Akiel]

i would suggest using n to control a for loop that calculates the Fn numbers. you may need to look up shift registers as well and a few examples. So the loop runs n times calculating the series as it goes.

Hope it helps 

[ChrissyC]

Hi Calavan,

This sounds like homework! To be clear from the start, nobody here on the forums is going to code this for you, but if you have a go we can give you tips/pointers and help if you've got any specific problems

Firstly I would get to grip with the LabVIEW basics: http://www.ni.com/gettingstarted/labviewbasics/ 

When you've had a look at those tutorials then you'll see the solution to your problem is very easy to implement in LabVIEW.

A couple of hints:

• for loops
• numeric VIs or a formula node

-CC

[Akiel]

my thoughts exactly, im happy to give pointers and once youve had a good go it constructive critisism. the search tool on this website is very good and so are the examples that ship with labview

Good Luck 

[Xenox]

Hi,

right click on your numeric control --> Data Entry --> Remove the checkmark from the Use Default Limits -->  Minimum field, set the value limit (1) and select Coerce.

Changing Data Ranges of Numeric Controls and Indicators

http://zone.ni.com/reference/en-XX/help/371361F-01/lvhowto/changing_data_ranges_of_nu/

[ChrissyC]

Oops, I think Xenox has posted in the wrong thread here 

[Xenox]

My post relates to his question:

"...I need to  make sure that the user is not able to enter any number less than one... "

[ChrissyC]

Ah sorry then, my mistake

-CC 

[speksih]

You can make this with shift register in a for loop quite easily.

Tip: You can pull down your shift-register node to get the value from the last round of FOR/WHILE-loop

Tip 2: You can also initialize pulled-down shift register node from last round for FOR-loops loop 0

This should help you enough to make your code.

[calavan11]

Thanks, I'll be posting my code soon