[R] test

[romzero]

Hi, i have that table



Thesis	Day	A	B	C
1	0	83.43	90.15	22.97
1	0	85.50	94.97	16.62
1	0	83.36	95.38	20.70
1	0	84.47	92.16	23.58
1	0	83.98	95.33	19.39
1	0	82.86	93.78	24.55
1	0	83.39	92.67	19.56
1	0	85.17	95.24	17.95
1	0	81.62	93.32	28.49
1	0	82.99	92.85	19.73
1	0	81.11	95.67	27.20
1	0	83.39	94.69	16.51
1	0	79.56	89.87	30.39
1	0	80.54	93.32	21.76
1	0	82.11	92.58	22.17
1	14	85.65	94.00	19.19
1	14	85.06	92.44	20.44
1	14	83.97	91.39	24.38
1	14	84.61	91.97	19.44
1	14	85.13	90.59	25.30
1	14	84.81	91.01	19.80
1	14	84.52	94.06	18.77
1	14	84.30	94.49	24.90
1	14	84.74	91.32	20.35
1	14	84.08	94.12	22.96
1	14	84.50	94.25	19.95
1	14	84.02	94.74	20.35
1	14	85.30	92.82	21.12
1	14	85.08	91.14	24.16
1	14	85.21	95.69	18.17
etc etc etc etc etc
2	0	83.43	90.15	22.97
2	0	85.50	94.97	16.62
2	0	83.36	95.38	20.70
2	0	84.47	92.16	23.58
2	0	83.98	95.33	19.39
2	0	82.86	93.78	24.55
2	0	83.39	92.67	19.56
2	0	85.17	95.24	17.95
2	0	81.62	93.32	28.49
2	0	82.99	92.85	19.73
2	0	81.11	95.67	27.20
2	0	83.39	94.69	16.51
2	0	79.56	89.87	30.39
2	0	80.54	93.32	21.76
2	0	82.11	92.58	22.17
2	14	84.48	91.23	20.44
2	14	85.22	93.08	22.54
2	14	83.89	92.74	25.11
etc etc etc etc etc

I need to subtract from every number the other numbers of the same thesis
and same day.

Example:
A(row1) - A (row2) (same for B and C)
A(row1) - A (row3)
etc until the last Thesis 1 and Day 0
A(row2) - A (row3)
etc etc until the last Thesis 1 and Day 0

Same for the others theses and days.

How can i do that?

Sorry for my english.
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