spline with NaNs

[mallet]

Hello,
I want to use spline with data containing a NaN value. I Matlab i got a
«Warning: all data points with NaN in their value will be ignored.» , in
Octave: nothing. 
But results aren’t same!
 
In Octave result is something like:
P =  
1.0e+04  *

        NaN      NaN      NaN  1.04957
        NaN      NaN      NaN  1.33682
        NaN      NaN      NaN  1.31066
        NaN      NaN      NaN  0.89316
        NaN      NaN      NaN  1.41084
        NaN      NaN      NaN  0.55912
        NaN      NaN      NaN  0.60132
        NaN      NaN      NaN  0.48378
        NaN      NaN      NaN  0.35128
        NaN      NaN      NaN  0.34070
        NaN      NaN      NaN  0.21421
        NaN      NaN      NaN  0.24062
etc.

And in Matlab, like:
P =
1.0e+04  *

    -0.13693  0.25408  0.17010  1.04957
    -0.13693  -0.15670  0.26747  1.33682
    0.60669  -0.56748  -0.45671  1.31066
    -0.96328  1.25258  0.22839  0.89316
    0.94185  -1.63727  -0.15630  1.41084
    -0.54077  1.18827  -0.60530  0.55912
    0.16757  -0.43404  0.14893  0.60132
    0.01527  0.06867  -0.21644  0.48378
    -0.09176  0.11448  -0.03330  0.35128
    0.11394  -0.16080  -0.07962  0.34070
    -0.09522  0.18103  -0.05940  0.21421
etc.


Command: spline (param.one,param.two);

With:

param.two =

  1.0e+04  *

  1.04957
  1.33682
  1.31066
  0.89316
  1.41084
  0.55912
  0.60132
  0.48378
  0.35128
  0.34070
  0.21421
  0.24062
  0.20902
  0.19097
  0.09576
  0.12853
  0.11706
  0.08552
  0.07094
  0.06900
  0.03823
  0.06705
  0.06800
  0.05187
  0.02961
  0.03719
  0.02631
  0.02686
  0.02365
  0.03510
      NaN
  0.01845
  0.01549
  0.01141
  0.00845
  0.00797
  0.00827
  0.00686
  0.00871
  0.00825
  0.00759
  0.01125
  0.01728
  0.00418
  0.01619
  0.00400
  0.00292
  0.00426
  0.00294
  0.02139
  0.00483
  0.00364
  0.00200
  0.00268
  0.00426
  0.00194
  0.00182
  0.01132
  0.00552
  0.00323
  0.01064
  0.00196
  0.00282
  0.00789
  0.00755
  0.00232
  0.00221
  0.00180
  0.00135
  0.00387
  0.00737
  0.00214
  0.00117
  0.00193
  0.00126
  0.00189
  0.00240
  0.00273
  0.00199
  0.00212
  0.00139
  0.00179
  0.00665
  0.00182
  0.00084
  0.00117
  0.00075
  0.00071
  0.00062
  0.00093
  0.00079
  0.00182

param.one
ans =

        0
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