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PHP - Finding FFT of an array

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0

I have an homework and I need to find first interpolation and then fft of an array. I found interpolation but I couldn't find how to do fft. I searched a lot but I'm a begginer about php. Is there anyone who can help me or show me a way with it ?

My Code:

<?php
echo " ".'<br>'.'<br>';
$arr=array(800,850,800,750,950,1100,950,950,850);

$x = array();
$y = array();
$running_total = 0;


for($i = 0; $i < count($arr); $i++)

 $y[$i] = $arr[$i];
 $running_total += $arr[$i];
 $x[$i] = $running_total;




$arrgraph = array_combine($y, $x);


$d = array();
for ($i=0 ; $i < count($arr) ; $i++ ) 

 $d[$i]=1000*$i;



$int = array();

for ($i=0; $i < count($arr); $i++) 

 $int[$i] = $y[$i]+($y[$i+1]-$y[$i])*($d[$i]-$x[$i])/($x[$i+1]-$x[$i]);

 

I need to find fft of $int array. Thanks.

php fft

share|improve this question

asked Mar 27 at 22:06

Tanay AcanTanay Acan

1

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have no clue what you mean by "find fft of $int array", but what keeps you from writing some code that helps you to find that?
  
  – Nico Haase
  Mar 27 at 22:15
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Did you google for FFT PHP? gist.github.com/mbijon/1332348
  
  – Dharman
  Mar 27 at 22:16
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  or another prominent hit on google: stackoverflow.com/questions/21966265/…
  
  – Jeff
  Mar 27 at 22:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you all, all I wanted is sources, sorry if I wasn't clear.
  
  – Tanay Acan
  Mar 27 at 22:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  phpclasses.org/package/…
  
  – Jeff
  Mar 27 at 22:19
  

  
  
  
  

add a comment | 

0

I have an homework and I need to find first interpolation and then fft of an array. I found interpolation but I couldn't find how to do fft. I searched a lot but I'm a begginer about php. Is there anyone who can help me or show me a way with it ?

My Code:

<?php
echo " ".'<br>'.'<br>';
$arr=array(800,850,800,750,950,1100,950,950,850);

$x = array();
$y = array();
$running_total = 0;


for($i = 0; $i < count($arr); $i++)

 $y[$i] = $arr[$i];
 $running_total += $arr[$i];
 $x[$i] = $running_total;




$arrgraph = array_combine($y, $x);


$d = array();
for ($i=0 ; $i < count($arr) ; $i++ ) 

 $d[$i]=1000*$i;



$int = array();

for ($i=0; $i < count($arr); $i++) 

 $int[$i] = $y[$i]+($y[$i+1]-$y[$i])*($d[$i]-$x[$i])/($x[$i+1]-$x[$i]);

 

I need to find fft of $int array. Thanks.

php fft

share|improve this question

asked Mar 27 at 22:06

Tanay AcanTanay Acan

1

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have no clue what you mean by "find fft of $int array", but what keeps you from writing some code that helps you to find that?
  
  – Nico Haase
  Mar 27 at 22:15
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Did you google for FFT PHP? gist.github.com/mbijon/1332348
  
  – Dharman
  Mar 27 at 22:16
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  or another prominent hit on google: stackoverflow.com/questions/21966265/…
  
  – Jeff
  Mar 27 at 22:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you all, all I wanted is sources, sorry if I wasn't clear.
  
  – Tanay Acan
  Mar 27 at 22:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  phpclasses.org/package/…
  
  – Jeff
  Mar 27 at 22:19
  

  
  
  
  

add a comment | 

I have an homework and I need to find first interpolation and then fft of an array. I found interpolation but I couldn't find how to do fft. I searched a lot but I'm a begginer about php. Is there anyone who can help me or show me a way with it ?

My Code:

<?php
echo " ".'<br>'.'<br>';
$arr=array(800,850,800,750,950,1100,950,950,850);

$x = array();
$y = array();
$running_total = 0;


for($i = 0; $i < count($arr); $i++)

 $y[$i] = $arr[$i];
 $running_total += $arr[$i];
 $x[$i] = $running_total;




$arrgraph = array_combine($y, $x);


$d = array();
for ($i=0 ; $i < count($arr) ; $i++ ) 

 $d[$i]=1000*$i;



$int = array();

for ($i=0; $i < count($arr); $i++) 

 $int[$i] = $y[$i]+($y[$i+1]-$y[$i])*($d[$i]-$x[$i])/($x[$i+1]-$x[$i]);

 

I need to find fft of $int array. Thanks.

php fft

share|improve this question

asked Mar 27 at 22:06

Tanay AcanTanay Acan

1

<?php
echo " ".'<br>'.'<br>';
$arr=array(800,850,800,750,950,1100,950,950,850);

$x = array();
$y = array();
$running_total = 0;


for($i = 0; $i < count($arr); $i++)

 $y[$i] = $arr[$i];
 $running_total += $arr[$i];
 $x[$i] = $running_total;




$arrgraph = array_combine($y, $x);


$d = array();
for ($i=0 ; $i < count($arr) ; $i++ ) 

 $d[$i]=1000*$i;



$int = array();

for ($i=0; $i < count($arr); $i++) 

 $int[$i] = $y[$i]+($y[$i+1]-$y[$i])*($d[$i]-$x[$i])/($x[$i+1]-$x[$i]);

 

share|improve this question

asked Mar 27 at 22:06

Tanay AcanTanay Acan

1

share|improve this question

asked Mar 27 at 22:06

Tanay AcanTanay Acan

1

asked Mar 27 at 22:06

Tanay AcanTanay Acan

1

asked Mar 27 at 22:06

Tanay AcanTanay Acan

1