please help me really stuck [Archive]

SarahH

06-26-2009, 06:03 PM

Hello All,

please could you help me as I am pulling my hair out with this one please could you look at my code and see where I am going wrong I am trying to write a program with the following :-

create an Array called fibArray which generates the first 20 fibonacci numbers

Then it should calculate the ratio by dividing each element of the first Array with the one before it and store these values in a second parrallel array called ratioArray

It should then find the first value of ratioArray that is closer to the golden ratio than 0.001m byt.

1.61803399 will be used as the value for the golden ratio.

finally it should display output in browser.

This is what I have currently:-

<html>

<body>

<script type="text/javascript">

var fibArray = new Array ();

document.write("<h4>The first 20 elements of the sequence are:</h4>");
for (i=0, j=1, k=0, fibArray =0; i<21; i++, fibArray=j+k, j=k, k=fibArray){
document.write(fibArray + ' ,');

}

for (i = 0; i < myfibArray.length; i++) document.write (myfibArray[i], ' - ', myfibArray[i] / 2, '<br>')

for (i = 0, j = 0; i < myfibArray.length; i++, j++) if (myfibArray[i] / 2 == 1.5)

document.write ('Line ', j, ' presents the value 1.5<br>')

var ratioArray= new Array();

for(i=0;i<fibArray.length;i++) {

var calculation = (myfibArray[i], ' - ', myfibArray[i] / 2, '<br>')

sequence.push(calculation);

}

</script>

</HEAD>
<BODY>
</BODY>
</HTML>

Please can someone help I have been trying to do this every night this week and am loosing hope that I will ever learn this language. Any help will be greatly appreciated.

Thankyou in advance

Sarah

Philip M

06-26-2009, 06:15 PM

A good deal of the trouble is that your array is

var fibArray = new Array ();

but you refer to it in several places as myfibArray

for (i = 0, j = 0; i < myfibArray.length; i++, j++) is not valid.

You must write a nested loop as

for (var i = 0; i <fibArray.length; i++) {
for (var j = 0; j <fibArray.length; j++) {

///.......

} end of j loop
} end of i loop

But your second loop is redundant.

for (i = 0; i < fibArray.length; i++) {
if ((fibArray / 2) == 1.5) {
document.write ('Array element " + i + " presents the value 1.5<br>"); // but where does the value 1.5 come in??? :confused:
}
}

[I]var calculation = (myfibArray[i], ' - ', myfibArray[i] / 2, '<br>')
sequence.push(calculation);
No idea what this is supposed to do. You cannot combine a mathematical calculation with a string.

You need to have a look at order of precedence of operations and use of brackets.
6-4/2 = 4 but (6-4)/2 = 1

Do please read the posting guidelines regarding silly thread titles. The thread title is supposed to help people who have a similar problem in future. Yours is useless for this purpose. Why not edit it to something meaningful such as Fibonacci Numbers And Golden Ratio.

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