knotR: Knot Diagrams using Bezier Curves

`perko_A` <-
structure(list(minsymvec = structure(c(-119.470803439003, -218.471499348544, 
-178.305589092384, -130.179742045392, 62.172652456508, -117.728000459666, 
-114.514890409492, -276.195487337856, -372.19092128352, -186.452164742939, 
-8.46841472410084, -169.094189709855, -221.628136097348, -24.845881861209, 
1.0611927412033, -501.009204837126, -644.634606552036, -756.963763609518, 
-795.943993146068, -484.515615481899, -292.975544459092, -148.507251699598, 
-413.885786796351, -614.809721831495, -390.616618198308, -312.404274356563, 
-125.179564182186, -402.577572120922, -159.720371651512, -211.906113028862, 
-170.811404026903, -76.9293457327405, -131.251401584929, -147.824893149922, 
-334.783275640338, -311.669253096069, -94.0294508751953, -67.6174398591864, 
-201.295450343764, -159.63999632728, -46.7268384887787, -550.417528799851, 
-688.960785469578, -763.204759234651, -790.318712452497, -527.924453821678, 
-407.814789753185, -227.750707805865, -224.108331944795, -501.016207159079, 
-686.447644477419, -354.579635211476, -256.752270367262, -68.8748763327868, 
-9.35326867631747, -441.967710202025), .Names = c("handle_A1", 
"handle_A2", "handle_A3", "handle_A4", "handle_A10", "handle_A11", 
"handle_A12", "handle_A13", "handle_A14", "handle_A15", "handle_A21", 
"handle_A22", "handle_A23", "handle_A24", "handle_A28", "handle_A29", 
"handle_A30", "handle_A31", "handle_A32", "handle_A39", "handle_A40", 
"handle_A41", "handle_A42", "handle_A43", "handle_A49", "handle_A50", 
"handle_A51", "handle_A56", "node1", "node2", "node3", "node4", 
"node11", "node12", "node13", "node14", "node15", "node21", "node22", 
"node23", "node28", "node29", "node30", "node31", "node32", "node38", 
"node39", "node40", "node41", "node42", "node43", "node49", "node50", 
"node51", "node52", "node56"), class = "minsymvec"), overunderobj = structure(c(26, 
9, 21, 1, 15, 5, 19, 10, 12, 23, 8, 27, 28, 11, 2, 16, 6, 20, 
22, 13), .Dim = c(10L, 2L)), symobj = structure(list(Mver = structure(c(23, 
12, 13, 14, 22, 21, 28, 11, 1, 2, 3, 15, 4, 25, 8, 7, 6, 26, 
27, 20, 9, 19, 18, 17, 5, 16), .Dim = c(13L, 2L)), xver = c(10, 
24), Mhor = NULL, xhor = NULL, Mrot = NULL, exact_h = NULL, exact_v = NULL, 
    mcdonalds = FALSE, celtic = FALSE, reefknot = FALSE, center_crossing = FALSE, 
    indep = structure(c(TRUE, TRUE, TRUE, TRUE, FALSE, FALSE, 
    FALSE, FALSE, FALSE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, 
    FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, TRUE, TRUE, 
    FALSE, FALSE, FALSE, TRUE, TRUE, TRUE, TRUE, TRUE, FALSE, 
    FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, TRUE, TRUE, 
    TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, TRUE, 
    FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, TRUE, TRUE, TRUE, 
    FALSE, FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, TRUE, 
    TRUE, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, 
    TRUE, FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, TRUE, TRUE, 
    TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, TRUE, 
    TRUE, TRUE, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, TRUE, 
    TRUE, TRUE, TRUE, FALSE, FALSE, FALSE, TRUE), .Names = c("handle_A1", 
    "handle_A2", "handle_A3", "handle_A4", "handle_A5", "handle_A6", 
    "handle_A7", "handle_A8", "handle_A9", "handle_A10", "handle_A11", 
    "handle_A12", "handle_A13", "handle_A14", "handle_A15", "handle_A16", 
    "handle_A17", "handle_A18", "handle_A19", "handle_A20", "handle_A21", 
    "handle_A22", "handle_A23", "handle_A24", "handle_A25", "handle_A26", 
    "handle_A27", "handle_A28", "handle_A29", "handle_A30", "handle_A31", 
    "handle_A32", "handle_A33", "handle_A34", "handle_A35", "handle_A36", 
    "handle_A37", "handle_A38", "handle_A39", "handle_A40", "handle_A41", 
    "handle_A42", "handle_A43", "handle_A44", "handle_A45", "handle_A46", 
    "handle_A47", "handle_A48", "handle_A49", "handle_A50", "handle_A51", 
    "handle_A52", "handle_A53", "handle_A54", "handle_A55", "handle_A56", 
    "node1", "node2", "node3", "node4", "node5", "node6", "node7", 
    "node8", "node9", "node10", "node11", "node12", "node13", 
    "node14", "node15", "node16", "node17", "node18", "node19", 
    "node20", "node21", "node22", "node23", "node24", "node25", 
    "node26", "node27", "node28", "node29", "node30", "node31", 
    "node32", "node33", "node34", "node35", "node36", "node37", 
    "node38", "node39", "node40", "node41", "node42", "node43", 
    "node44", "node45", "node46", "node47", "node48", "node49", 
    "node50", "node51", "node52", "node53", "node54", "node55", 
    "node56"))), .Names = c("Mver", "xver", "Mhor", "xhor", "Mrot", 
"exact_h", "exact_v", "mcdonalds", "celtic", "reefknot", "center_crossing", 
"indep"))), .Names = c("minsymvec", "overunderobj", "symobj"), class = "knot")