title: system is computationally singular error
body: <p>I am using <a href="http://cran.r-project.org/web/packages/fastICA/fastICA.pdf" rel="noreferrer">fastICA</a> package in r. In this package, I am using fastICA function, which have some parameters. If I set <code>n.comp</code> to 2, that works fine, but if I set this parameter to 3 or more in this function:</p>
  
  <pre><code> ica&lt;-fastICA(datalist,n.comp=3)
  </code></pre>
  
  <p>datalist is here a matrix with 20 rows and 4 columns:</p>
  
  <pre><code>     [,1]    [,2]     [,3]   [,4]
   [1,] 567.00 324.225 281.0889 538.25
   [2,] 557.75 317.500 269.5556 529.15
   [3,] 543.75 309.900 264.5778 515.95
   [4,] 557.00 316.225 265.0889 528.25
   [5,] 538.25 307.750 266.6667 510.95
   [6,] 531.25 301.025 250.0222 503.70
   [7,] 545.00 311.800 270.9333 517.40
   [8,] 550.00 316.925 284.3778 522.65
   [9,] 514.75 290.300 235.6000 487.75
  [10,] 518.00 293.800 245.1556 491.20
  [11,] 553.75 318.125 281.6667 526.00
  [12,] 563.50 325.925 297.2667 535.75
  [13,] 540.00 303.300 241.1556 511.40
  [14,] 546.00 310.350 261.6444 517.90
  [15,] 567.25 324.425 281.4889 538.50
  [16,] 577.75 330.125 285.2222 548.40
  [17,] 560.75 317.425 262.3778 531.60
  [18,] 570.00 323.925 272.8222 540.65
  [19,] 569.00 324.700 278.8444 540.00
  [20,] 565.50 324.150 284.1333 537.00
  </code></pre>
  
  <p>I am getting this error:</p>
  
  <pre><code>Error in solve.default(w %*% t(w)) : 
    system is computationally singular: reciprocal condition number = 1.16873e-16
  </code></pre>
  
  <p>could you please say me why I am getting this error and how can I solve it?   </p>