[R] dataframe manipulation

[antonio rodriguez]

Hi,

Having a dataframe 'l1' (dput output is below):

 >dim(l1)
1274   2

 >l1[1:12,]

            Var1 Freq
1  1988-01-13    1
2  1988-01-16    1
3  1988-01-20    3
4  1988-01-25    2
5  1988-01-30    1
6  1988-02-01    5
7  1988-02-08    4
8  1988-02-14    1
9  1988-02-16    1
10 1988-02-18    4
11 1988-02-24    2
12 1988-03-04    1


I want to extract the times "1988-01", "1988-02",...,"2005-12"  are 
present, in order to know, for example, that 1988-01 = 5 days   1988-02 
= 6 days and so on. The Freq column doesn't matter in this case, just 
the Var1 column

I've been trying with:

regexpr("2005-03-",l1$Var1) 

But the result is not satisfactory since I need to find and count where 
these values are.

Thanks

Antonio


dput(l1,control="all")

structure(list(Var1 = structure(as.integer(c(1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70,
71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86,
87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101,
102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114,
115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140,
141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153,
154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166,
167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179,
180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192,
193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205,
206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218,
219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231,
232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244,
245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257,
258, 259, 260, 261, 262, 263, 264, 265, 266, 267, 268, 269, 270,
271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283,
284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296,
297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309,
310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322,
323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335,
336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348,
349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361,
362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374,
375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387,
388, 389, 390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 400,
401, 402, 403, 404, 405, 406, 407, 408, 409, 410, 411, 412, 413,
414, 415, 416, 417, 418, 419, 420, 421, 422, 423, 424, 425, 426,
427, 428, 429, 430, 431, 432, 433, 434, 435, 436, 437, 438, 439,
440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452,
453, 454, 455, 456, 457, 458, 459, 460, 461, 462, 463, 464, 465,
466, 467, 468, 469, 470, 471, 472, 473, 474, 475, 476, 477, 478,
479, 480, 481, 482, 483, 484, 485, 486, 487, 488, 489, 490, 491,
492, 493, 494, 495, 496, 497, 498, 499, 500, 501, 502, 503, 504,
505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517,
518, 519, 520, 521, 522, 523, 524, 525, 526, 527, 528, 529, 530,
531, 532, 533, 534, 535, 536, 537, 538, 539, 540, 541, 542, 543,
544, 545, 546, 547, 548, 549, 550, 551, 552, 553, 554, 555, 556,
557, 558, 559, 560, 561, 562, 563, 564, 565, 566, 567, 568, 569,
570, 571, 572, 573, 574, 575, 576, 577, 578, 579, 580, 581, 582,
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596, 597, 598, 599, 600, 601, 602, 603, 604, 605, 606, 607, 608,
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622, 623, 624, 625, 626, 627, 628, 629, 630, 631, 632, 633, 634,
635, 636, 637, 638, 639, 640, 641, 642, 643, 644, 645, 646, 647,
648, 649, 650, 651, 652, 653, 654, 655, 656, 657, 658, 659, 660,
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1263, 1264, 1265, 1266, 1267, 1268, 1269, 1270, 1271, 1272, 1273,
1274)), .Label = c("1988-01-13", "1988-01-16", "1988-01-20",
"1988-01-25", "1988-01-30", "1988-02-01", "1988-02-08", "1988-02-14",
"1988-02-16", "1988-02-18", "1988-02-24", "1988-03-04", "1988-03-07",
"1988-03-14", "1988-03-21", "1988-03-29", "1988-04-06", "1988-04-08",
"1988-04-11", "1988-04-14", "1988-04-21", "1988-04-28", "1988-05-01",
"1988-05-13", "1988-05-16", "1988-05-25", "1988-05-30", "1988-06-06",
"1988-06-16", "1988-06-26", "1988-07-02", "1988-07-07", "1988-07-10",
"1988-07-12", "1988-07-15", "1988-07-18", "1988-07-31", "1988-08-05",
"1988-08-10", "1988-08-14", "1988-08-25", "1988-09-01", "1988-09-05",
"1988-09-09", "1988-09-12", "1988-09-19", "1988-09-24", "1988-09-29",
"1988-10-02", "1988-10-06", "1988-10-11", "1988-10-15", "1988-10-17",
"1988-10-25", "1988-10-29", "1988-10-31", "1988-11-09", "1988-11-11",
"1988-11-17", "1988-11-20", "1988-11-24", "1988-11-28", "1988-12-01",
"1988-12-04", "1988-12-06", "1988-12-09", "1988-12-17", "1988-12-21",
"1989-01-13", "1989-01-17", "1989-01-19", "1989-01-22", "1989-01-29",
"1989-01-31", "1989-02-04", "1989-02-09", "1989-02-28", "1989-03-07",
"1989-03-15", "1989-03-22", "1989-03-30", "1989-04-05", "1989-04-11",
"1989-04-18", "1989-04-20", "1989-04-22", "1989-04-28", "1989-05-01",
"1989-05-12", "1989-05-15", "1989-05-24", "1989-05-30", "1989-06-03",
"1989-06-06", "1989-06-09", "1989-06-11", "1989-06-21", "1989-06-26",
"1989-06-30", "1989-07-02", "1989-07-06", "1989-07-11", "1989-07-14",
"1989-07-21", "1989-07-26", "1989-07-31", "1989-08-02", "1989-08-09",
"1989-08-12", "1989-08-21", "1989-08-29", "1989-09-04", "1989-09-06",
"1989-09-10", "1989-09-19", "1989-09-23", "1989-09-26", "1989-09-30",
"1989-10-08", "1989-10-13", "1989-10-22", "1989-10-28", "1989-11-02",
"1989-11-06", "1989-11-14", "1989-11-17", "1989-11-24", "1989-11-27",
"1989-12-09", "1989-12-11", "1989-12-19", "1989-12-29", "1990-01-02",
"1990-01-04", "1990-01-07", "1990-01-10", "1990-01-13", "1990-01-30",
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"1990-03-15", "1990-03-19", "1990-03-28", "1990-04-02", "1990-04-06",
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"1990-06-13", "1990-06-16", "1990-06-21", "1990-06-25", "1990-06-27",
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"1990-08-06", "1990-08-10", "1990-08-14", "1990-08-28", "1990-09-06",
"1990-09-27", "1990-10-02", "1990-10-04", "1990-10-12", "1990-10-17",
"1990-10-20", "1990-10-23", "1990-10-31", "1990-11-12", "1990-11-18",
"1990-11-23", "1990-11-27", "1990-12-04", "1990-12-07", "1990-12-13",
"1990-12-16", "1990-12-18", "1990-12-27", "1991-01-09", "1991-01-12",
"1991-01-14", "1991-01-19", "1991-01-24", "1991-02-04", "1991-02-07",
"1991-02-10", "1991-02-12", "1991-02-14", "1991-02-20", "1991-02-25",
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"1991-03-28", "1991-04-04", "1991-04-07", "1991-04-17", "1991-04-21",
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"1993-04-17", "1993-04-21", "1993-04-23", "1993-04-27", "1993-04-29",
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"1994-08-26", "1994-08-30", "1994-09-02", "1994-09-05", "1994-09-14",
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"1995-07-25", "1995-07-27", "1995-08-03", "1995-08-09", "1995-08-17",
"1995-08-21", "1995-08-25", "1995-09-01", "1995-09-05", "1995-09-10",
"1995-09-17", "1995-09-26", "1995-10-01", "1995-10-05", "1995-10-10",
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"1996-04-04", "1996-04-06", "1996-04-13", "1996-04-15", "1996-04-18",
"1996-04-22", "1996-04-24", "1996-04-27", "1996-04-29", "1996-05-04",
"1996-05-09", "1996-05-12", "1996-05-19", "1996-05-23", "1996-05-29",
"1996-06-04", "1996-06-08", "1996-06-11", "1996-06-17", "1996-06-25",
"1996-06-30", "1996-07-03", "1996-07-12", "1996-07-15", "1996-07-21",
"1996-07-23", "1996-07-28", "1996-07-31", "1996-08-03", "1996-08-08",
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"2005-12-30"), class = "factor"), Freq = as.integer(c(1, 1, 3,
2, 1, 5, 4, 1, 1, 4, 2, 1, 1, 1, 7, 1, 1, 2, 2, 2, 4, 2, 2, 1,
5, 4, 1, 8, 5, 4, 4, 2, 1, 2, 2, 2, 3, 3, 2, 5, 1, 3, 1, 2, 6,
3, 3, 1, 2, 2, 3, 1, 2, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 1, 1, 1,
3, 2, 1, 1, 2, 1, 1, 2, 2, 1, 2, 2, 2, 2, 4, 3, 5, 1, 1, 2, 1,
4, 2, 7, 3, 3, 1, 1, 1, 2, 3, 1, 1, 3, 1, 2, 5, 2, 1, 1, 4, 1,
5, 3, 2, 1, 3, 5, 3, 2, 1, 1, 1, 3, 1, 1, 1, 6, 2, 1, 1, 3, 1,
3, 2, 1, 1, 2, 2, 1, 9, 3, 6, 6, 3, 1, 1, 2, 7, 2, 1, 1, 2, 2,
4, 3, 3, 1, 9, 3, 6, 2, 1, 4, 2, 1, 4, 6, 2, 4, 2, 3, 3, 2, 8,
2, 3, 3, 1, 6, 1, 1, 2, 2, 2, 5, 4, 1, 4, 1, 1, 1, 1, 1, 1, 2,
1, 4, 3, 2, 1, 1, 1, 1, 2, 1, 1, 1, 3, 2, 3, 1, 5, 2, 6, 2, 10,
1, 6, 2, 3, 3, 1, 4, 1, 6, 1, 2, 2, 1, 1, 1, 2, 3, 1, 3, 2, 1,
2, 5, 1, 2, 2, 3, 3, 1, 1, 1, 2, 3, 6, 9, 1, 1, 1, 1, 2, 3, 3,
2, 2, 4, 1, 1, 1, 1, 1, 3, 7, 1, 2, 2, 1, 1, 1, 6, 10, 1, 1,
1, 5, 7, 1, 1, 7, 2, 6, 1, 2, 9, 5, 3, 5, 5, 2, 1, 1, 4, 1, 4,
2, 2, 2, 2, 1, 2, 4, 4, 2, 3, 5, 1, 1, 3, 1, 3, 1, 3, 7, 3, 13,
1, 1, 1, 2, 1, 2, 1, 1, 1, 4, 1, 2, 2, 1, 6, 2, 1, 3, 5, 8, 1,
1, 1, 1, 1, 1, 4, 4, 2, 1, 4, 2, 1, 1, 1, 3, 1, 1, 1, 3, 5, 1,
1, 12, 1, 1, 1, 1, 3, 2, 1, 2, 5, 1, 2, 1, 3, 1, 2, 9, 6, 2,
2, 7, 2, 1, 2, 2, 3, 1, 1, 1, 5, 4, 1, 1, 1, 2, 2, 2, 3, 2, 1,
1, 1, 2, 1, 2, 5, 3, 2, 1, 2, 2, 2, 3, 5, 2, 1, 2, 1, 2, 4, 2,
2, 1, 3, 1, 3, 5, 10, 4, 6, 2, 3, 1, 1, 1, 3, 2, 4, 2, 1, 1,
2, 1, 6, 2, 1, 3, 1, 3, 2, 2, 8, 3, 2, 1, 9, 1, 2, 7, 1, 1, 5,
3, 4, 2, 1, 1, 5, 3, 2, 1, 1, 2, 1, 1, 1, 1, 1, 1, 3, 1, 1, 3,
1, 2, 1, 1, 1, 1, 2, 3, 1, 5, 3, 1, 1, 1, 7, 6, 1, 6, 1, 1, 3,
4, 2, 1, 1, 6, 6, 1, 2, 4, 1, 3, 3, 4, 3, 2, 1, 1, 3, 3, 7, 4,
1, 2, 3, 2, 2, 7, 1, 1, 1, 3, 1, 4, 2, 1, 3, 1, 1, 2, 1, 2, 1,
1, 1, 1, 4, 3, 3, 2, 4, 2, 1, 3, 1, 1, 2, 2, 2, 1, 1, 5, 1, 2,
3, 1, 2, 1, 4, 1, 1, 4, 3, 3, 1, 2, 1, 3, 5, 4, 2, 8, 1, 5, 1,
2, 2, 2, 3, 4, 4, 1, 1, 1, 3, 2, 7, 1, 3, 1, 2, 2, 3, 2, 3, 2,
3, 6, 2, 3, 2, 1, 3, 2, 2, 1, 2, 4, 1, 3, 2, 1, 3, 4, 1, 3, 3,
4, 3, 1, 3, 1, 3, 2, 3, 7, 2, 2, 3, 1, 1, 3, 3, 1, 2, 2, 3, 2,
2, 1, 2, 1, 1, 3, 4, 2, 4, 1, 1, 4, 5, 3, 2, 2, 1, 2, 9, 5, 3,
5, 1, 13, 1, 1, 1, 1, 1, 2, 8, 2, 2, 1, 2, 2, 1, 2, 1, 1, 1,
1, 2, 1, 1, 2, 2, 7, 1, 2, 1, 7, 3, 2, 1, 1, 3, 2, 3, 1, 1, 1,
5, 3, 2, 1, 11, 1, 2, 2, 4, 2, 1, 11, 2, 2, 2, 5, 4, 1, 3, 1,
5, 1, 2, 1, 7, 1, 5, 5, 7, 1, 5, 7, 5, 2, 5, 1, 2, 1, 3, 1, 3,
4, 4, 1, 3, 1, 1, 1, 1, 1, 3, 2, 2, 1, 1, 2, 1, 1, 2, 2, 1, 2,
4, 1, 2, 1, 2, 2, 1, 1, 1, 1, 2, 1, 7, 6, 3, 6, 1, 3, 2, 5, 2,
1, 2, 5, 1, 5, 2, 1, 1, 4, 2, 1, 2, 5, 2, 6, 7, 3, 1, 1, 2, 3,
3, 2, 1, 1, 2, 5, 1, 1, 4, 2, 9, 1, 5, 3, 1, 1, 2, 2, 2, 3, 3,
4, 2, 5, 4, 1, 1, 1, 3, 1, 1, 1, 1, 2, 2, 1, 1, 3, 1, 3, 2, 3,
2, 1, 1, 2, 2, 2, 1, 3, 5, 2, 2, 2, 1, 4, 1, 4, 4, 3, 1, 5, 2,
2, 4, 4, 1, 1, 1, 2, 1, 2, 8, 1, 9, 6, 4, 1, 2, 7, 1, 6, 1, 1,
3, 3, 1, 4, 1, 3, 1, 3, 3, 2, 1, 1, 1, 2, 1, 1, 2, 8, 4, 1, 3,
1, 4, 3, 1, 3, 3, 1, 7, 2, 4, 1, 1, 2, 1, 2, 3, 3, 4, 2, 3, 2,
2, 1, 1, 1, 1, 1, 8, 3, 7, 3, 1, 4, 4, 2, 1, 1, 3, 4, 2, 1, 2,
3, 2, 1, 1, 2, 2, 2, 7, 4, 1, 2, 1, 3, 2, 3, 1, 2, 2, 1, 1, 7,
1, 5, 4, 1, 2, 1, 1, 4, 1, 1, 4, 1, 1, 1, 2, 2, 1, 2, 1, 1, 8,
2, 1, 1, 1, 2, 4, 2, 6, 1, 5, 2, 1, 2, 2, 3, 2, 1, 1, 9, 10,
1, 6, 1, 1, 8, 6, 1, 2, 3, 1, 1, 2, 2, 1, 1, 1, 1, 7, 2, 1, 1,
2, 1, 4, 1, 1, 3, 1, 1, 1, 2, 7, 3, 5, 2, 1, 1, 3, 1, 5, 3, 2,
1, 1, 1, 3, 5, 1, 3, 4, 1, 1, 8, 2, 1, 1, 2, 4, 1, 1, 5, 2, 1,
1, 4, 3, 2, 8, 2, 1, 3, 2, 2, 2, 4, 2, 5, 3, 5, 3, 5, 1, 2, 3,
1, 2, 2, 1, 1, 1, 1, 2, 2, 1, 2, 2, 2, 1, 1, 2, 2, 3, 1, 5, 2,
1, 2, 2, 1, 4, 6, 1, 7, 1, 1, 3, 4, 1, 1, 4, 1, 2, 2, 4, 1, 1,
6, 2, 5, 2, 4, 6, 5, 3, 2, 8, 3, 1, 1, 10, 6, 2, 1, 3, 2, 2,
9, 3, 1, 3, 5, 1, 1, 5, 1, 4, 1, 1, 2, 1, 1, 7, 1, 2, 2, 3, 1,
3, 1, 1, 1, 1, 1, 6, 1, 4, 1, 2, 1, 1, 1, 2, 2, 2, 6, 1, 2, 1,
5, 1, 1, 1, 1, 1, 5, 2, 5, 13, 1, 1, 2, 3, 1, 2, 1, 3, 2, 3,
7, 4, 1, 1, 7, 1, 2, 1, 3, 4, 1, 3, 3, 8, 7, 3, 5, 2, 1, 3, 3,
1, 1, 2, 6, 1, 2, 1, 1, 2, 1, 2, 3, 1, 2, 7, 6, 1, 2, 1))), .Names = 
c("Var1",
"Freq"), row.names = as.integer(c(NA, 1274)), class = "data.frame")