title: Split vector and apply Mann Kendall test
body: <p>I have a long vector of financial time series information, price and volume. I expand the price vector based on the volume vector so I essentially get a price per share traded, and so only one vector is analyzed. 
  I would like to split this vector into lengths of 100 (could be any number) each, and apply the Mann-Kendall trend analysis on each of these new vectors. 
  Below is the code I have for this. </p>
  
  <p>I am getting an error from the Mann Kendall test, as this split method is producing outputs as a list. </p>
  
  <p>Is there a way to create a new vector and run the Mann Kendall test on each vector, with the output from each test easily acessible?</p>
  
  <pre><code>library(Kendall)
  
  priceexp &lt;- rep(price, volume)
  
  max &lt;- 100
  xx &lt;- seq_along(priceexp)
  d1 &lt;- split(priceexp, ceiling(xx/max))
  
  for(i in (1:length(d1))) {
      MannKendall(d1[i])
  }
  </code></pre>
  
  <p>A sample of the two vectors for input: </p>
  
  <pre><code>"price","volume"
  125,4020
  125,1100
  125,191
  124.8,329
  125.5,400
  125.6,100
  125.7,600
  125.2,686
  125.2,898
  125.2,1416
  125.6,150
  125.6,500
  125.6,200
  125.6,41
  125.5,400
  125.7,300
  125.7,14
  125.7,1200
  125.7,300
  125.7,686
  125.8,1000
  125.8,1700
  125.8,144
  125.8,225
  125.9,500
  125.9,446
  126,500
  126,225
  126,500
  126,250
  126,28
  126,340
  126,600
  125.9,275
  125.9,323
  125.9,152
  125.8,1931
  125.9,196
  125.9,571
  125.8,214
  125.8,300
  125.7,353
  125.8,432
  125.8,1356
  126,400
  126,2133
  126,300
  126,190
  126,376
  125.8,186
  126,750
  126,431
  126,1403
  126,39
  125.9,259
  126.1,900
  126.1,307
  126.1,124
  126.1,750
  126.2,100
  126.2,117
  126,200
  126,94
  126,453
  126,149
  126,661
  126,600
  126,549
  126,315
  126,318
  126,297
  125.9,300
  125.9,454
  125.9,370
  125.8,114
  125.8,1100
  125.8,7344
  125.8,2656
  125.8,333
  126,120
  125.9,878
  125.9,462
  125.9,899
  125.9,45
  125.7,2000
  125.7,889
  125.7,4611
  125.7,2500
  125.9,652
  125.9,1610
  125.9,332
  125.9,750
  125.9,627
  125.9,473
  125.9,182
  125.9,32
  125.9,1305
  125.9,98
  125.9,330
  125.9,373
  125.9,636
  125.9,1291
  125.9,1675
  125.9,1029
  125.9,314
  125.9,400
  125.9,699
  125.9,300
  125.8,300
  125.8,7
  126,659
  125.9,750
  126,441
  126,2000
  126,86
  126,300
  126,1300
  125.9,243
  125.9,456
  125.9,64
  126,400
  126,2000
  125.9,319
  125.9,423
  125.8,447
  125.8,387
  125.8,352
  125.8,200
  125.8,1123
  125.8,379
  125.8,300
  125.8,600
  125.8,61
  125.8,340
  125.8,200
  </code></pre>