Open the expert window.

http://iridl.ldeo.columbia.edu/expert/
Input all the commands starting 'SOURCES...' from under each problem below, and press OK.

## 1 (i)
### This performs PCA on annual SST anomalies for 1900-2012. The output on the page has
### links to eigen spectrum, eigen vectors, principal components. You can click on the
### desired link and get the output..
 SOURCES .KAPLAN .EXTENDED .v2 .ssta
  T (Jan 1900) (Dec 2012) RANGE
  T 12 boxAverage
  T 12 STEP
  [T]standardize
  [X Y][T]svd

  #######################
  
  ## 1(i)  to see individual spatial patterns, 
  ## change to 'ev 1 RANGE', 'ev 2 RANGE', etc. in the command set below to get
  ## spatial patterns of 1, 2, 3 and 4 modes
   SOURCES .KAPLAN .EXTENDED .v2 .ssta
  T (Jan 1900) (Dec 2012) RANGE
  T 12 boxAverage
  T 12 STEP
    [T]standardize
  [X Y][T]svd
  .Ss
  ev 3 RANGE
  /color_smoothing null def
  X Y fig- colors |
          contours coasts -fig
### 1(i) change ev 1 RANGE, ev 2 RANGE etc. to get
### temporal patterns of first 4 modes		  
SOURCES .KAPLAN .EXTENDED .v2 .ssta
  T (Jan 1900) (Dec 2012) RANGE
  T 12 boxAverage
  T 12 STEP
    [T]standardize
  [X Y][T]svd
  .Ts
  ev 4 RANGE

### 1(ii)  mode 2 is ENSO remove and same commands as above to get
## .S, .Ts etc.
 SOURCES .KAPLAN .EXTENDED .v2 .ssta
  T (Jan 1900) (Dec 2012) RANGE
  T 12 boxAverage
  T 12 STEP
    [T]standardize
  [X Y][T]svd
  ev 2 RANGE
  Ss
   Ts[ev]mulsum
   SOURCES .KAPLAN .EXTENDED .v2 .ssta
    T (Jan 1900) (Dec 2012) RANGE
    T 12 boxAverage
    T 12 STEP
    exch sub
	  [T]standardize
   [X Y][T]svd
   .Ss
   ev 4 RANGE
   /color_smoothing null def
   X Y fig- colors |
           contours coasts -fig
#### PCs
		    .Ts
   ev 4 RANGE

  
### 1(iii) change the years to get the sub-periods

####################################################
#### 2 PCA on climate div pcp and correlate with PCs of SST
 expert
 SOURCES .NOAA .NCDC .CIRS .ClimateDivision .pcp
  T (Nov 1958) (Dec 2012) RANGE
  T 5 splitstreamgrid
  T (Nov) (Dec) (Jan) (Feb) (Mar) VALUES
  [T]average
T2 12 STEP
  T2 /T renameGRID
  SOURCES .KAPLAN .EXTENDED .v2 .ssta
   T (Nov 1958) (Mar 2013) RANGE
   T 5 splitstreamgrid
   T (Nov) (Dec) (Jan) (Feb) (Mar) VALUES
   [T]average
T2 12 STEP
   T2 /T renameGRID
     [T]standardize
   [X Y][T]svd
   ev 2 RANGE
   .Ts
   T 2 index .T replaceGRID
   [T]correlate
  IDIV 201 207 RANGE
################
### scatterplot PC 1 of precip with PC2 of SST
 expert
 SOURCES .NOAA .NCDC .CIRS .ClimateDivision .pcp
  T (Nov 1958) (Mar 2013) RANGE
  T 5 splitstreamgrid
  T (Nov) (Dec) (Jan) (Feb) (Mar) VALUES
  [T]average
T2 12 STEP
  T2 /T renameGRID
    [T]standardize
  [IDIV][T]svd
  ev 1 RANGE
  .Ts
  SOURCES .KAPLAN .EXTENDED .v2 .ssta
   T (Nov 1958) (Mar 2013) RANGE
   T 5 splitstreamgrid
   T (Nov) (Dec) (Jan) (Feb) (Mar) VALUES
   [T]average
T2 12 STEP
   T2 /T renameGRID
   [X Y][T]svd
   ev 2 RANGE
   .Ts
   ev 2 index .ev replaceGRID
   fig: scatter :fig