How to label connected components in a disconnected graph?












1















I have some disconnected graph composed of three connected components. This graph is produced by the following commands in the igraph R:



library(igraph)
x1 <- c(1:7, 2, 8:14, 10, 15:21, 18)
x2 <- c(rep(0, 7), 1, rep(0, 7), 1, rep(0, 7), 1)
m <- cbind(x1, x2)
g <- graph.formula(1-2, 2-3, 3-4, 4-5, 5-6, 6-7, 2-8,
9-10, 10-11, 11-12, 12-13, 13-14, 14-15, 11-16,
17-18, 18-19, 19-20, 20-21, 21-22, 22-23, 20-24)
plot(g, layout = m, rescale = F, xlim = c(0.5, 21.5), vertex.size = 20,
vertex.label = NA, edge.color = "black", vertex.color = "black")


The resulting disconnected graph is plotted below:
enter image description here



I want to label every disconnected components by a letter, for instance "A", "B" and "C". Alternatively, I want to make some subtitles for every connected components in the igraph R ?










share|improve this question





























    1















    I have some disconnected graph composed of three connected components. This graph is produced by the following commands in the igraph R:



    library(igraph)
    x1 <- c(1:7, 2, 8:14, 10, 15:21, 18)
    x2 <- c(rep(0, 7), 1, rep(0, 7), 1, rep(0, 7), 1)
    m <- cbind(x1, x2)
    g <- graph.formula(1-2, 2-3, 3-4, 4-5, 5-6, 6-7, 2-8,
    9-10, 10-11, 11-12, 12-13, 13-14, 14-15, 11-16,
    17-18, 18-19, 19-20, 20-21, 21-22, 22-23, 20-24)
    plot(g, layout = m, rescale = F, xlim = c(0.5, 21.5), vertex.size = 20,
    vertex.label = NA, edge.color = "black", vertex.color = "black")


    The resulting disconnected graph is plotted below:
    enter image description here



    I want to label every disconnected components by a letter, for instance "A", "B" and "C". Alternatively, I want to make some subtitles for every connected components in the igraph R ?










    share|improve this question



























      1












      1








      1


      1






      I have some disconnected graph composed of three connected components. This graph is produced by the following commands in the igraph R:



      library(igraph)
      x1 <- c(1:7, 2, 8:14, 10, 15:21, 18)
      x2 <- c(rep(0, 7), 1, rep(0, 7), 1, rep(0, 7), 1)
      m <- cbind(x1, x2)
      g <- graph.formula(1-2, 2-3, 3-4, 4-5, 5-6, 6-7, 2-8,
      9-10, 10-11, 11-12, 12-13, 13-14, 14-15, 11-16,
      17-18, 18-19, 19-20, 20-21, 21-22, 22-23, 20-24)
      plot(g, layout = m, rescale = F, xlim = c(0.5, 21.5), vertex.size = 20,
      vertex.label = NA, edge.color = "black", vertex.color = "black")


      The resulting disconnected graph is plotted below:
      enter image description here



      I want to label every disconnected components by a letter, for instance "A", "B" and "C". Alternatively, I want to make some subtitles for every connected components in the igraph R ?










      share|improve this question
















      I have some disconnected graph composed of three connected components. This graph is produced by the following commands in the igraph R:



      library(igraph)
      x1 <- c(1:7, 2, 8:14, 10, 15:21, 18)
      x2 <- c(rep(0, 7), 1, rep(0, 7), 1, rep(0, 7), 1)
      m <- cbind(x1, x2)
      g <- graph.formula(1-2, 2-3, 3-4, 4-5, 5-6, 6-7, 2-8,
      9-10, 10-11, 11-12, 12-13, 13-14, 14-15, 11-16,
      17-18, 18-19, 19-20, 20-21, 21-22, 22-23, 20-24)
      plot(g, layout = m, rescale = F, xlim = c(0.5, 21.5), vertex.size = 20,
      vertex.label = NA, edge.color = "black", vertex.color = "black")


      The resulting disconnected graph is plotted below:
      enter image description here



      I want to label every disconnected components by a letter, for instance "A", "B" and "C". Alternatively, I want to make some subtitles for every connected components in the igraph R ?







      r igraph






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 22 '18 at 0:30









      Henrik

      42.1k994110




      42.1k994110










      asked Nov 21 '18 at 22:51









      Piotr WilczekPiotr Wilczek

      60118




      60118
























          1 Answer
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          Use components to get the cluster id. To center labels horizontally within each id, use tapply to calculate the midpoint of x values in 'm'. For the vertical position, use min of the y values and a suitable offset. Use text to add labels.



          m <- cbind(m, id = components(g)$membership)
          xs <- tapply(m[ , "x1"], m[ , "id"], function(x) mean(range(x)))
          ys <- tapply(m[ , "x2"], m[ , "id"], min)
          plot(g, layout = m, rescale = F, xlim = c(0.5, 21.5), vertex.size = 20,
          vertex.label = NA, edge.color = "black", vertex.color = "black")
          text(xs, ys - 0.6, LETTERS[1:3])


          enter image description here






          share|improve this answer





















          • 1





            Thanks for answer. This is a very good solution.

            – Piotr Wilczek
            Nov 22 '18 at 0:27











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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          2














          Use components to get the cluster id. To center labels horizontally within each id, use tapply to calculate the midpoint of x values in 'm'. For the vertical position, use min of the y values and a suitable offset. Use text to add labels.



          m <- cbind(m, id = components(g)$membership)
          xs <- tapply(m[ , "x1"], m[ , "id"], function(x) mean(range(x)))
          ys <- tapply(m[ , "x2"], m[ , "id"], min)
          plot(g, layout = m, rescale = F, xlim = c(0.5, 21.5), vertex.size = 20,
          vertex.label = NA, edge.color = "black", vertex.color = "black")
          text(xs, ys - 0.6, LETTERS[1:3])


          enter image description here






          share|improve this answer





















          • 1





            Thanks for answer. This is a very good solution.

            – Piotr Wilczek
            Nov 22 '18 at 0:27
















          2














          Use components to get the cluster id. To center labels horizontally within each id, use tapply to calculate the midpoint of x values in 'm'. For the vertical position, use min of the y values and a suitable offset. Use text to add labels.



          m <- cbind(m, id = components(g)$membership)
          xs <- tapply(m[ , "x1"], m[ , "id"], function(x) mean(range(x)))
          ys <- tapply(m[ , "x2"], m[ , "id"], min)
          plot(g, layout = m, rescale = F, xlim = c(0.5, 21.5), vertex.size = 20,
          vertex.label = NA, edge.color = "black", vertex.color = "black")
          text(xs, ys - 0.6, LETTERS[1:3])


          enter image description here






          share|improve this answer





















          • 1





            Thanks for answer. This is a very good solution.

            – Piotr Wilczek
            Nov 22 '18 at 0:27














          2












          2








          2







          Use components to get the cluster id. To center labels horizontally within each id, use tapply to calculate the midpoint of x values in 'm'. For the vertical position, use min of the y values and a suitable offset. Use text to add labels.



          m <- cbind(m, id = components(g)$membership)
          xs <- tapply(m[ , "x1"], m[ , "id"], function(x) mean(range(x)))
          ys <- tapply(m[ , "x2"], m[ , "id"], min)
          plot(g, layout = m, rescale = F, xlim = c(0.5, 21.5), vertex.size = 20,
          vertex.label = NA, edge.color = "black", vertex.color = "black")
          text(xs, ys - 0.6, LETTERS[1:3])


          enter image description here






          share|improve this answer















          Use components to get the cluster id. To center labels horizontally within each id, use tapply to calculate the midpoint of x values in 'm'. For the vertical position, use min of the y values and a suitable offset. Use text to add labels.



          m <- cbind(m, id = components(g)$membership)
          xs <- tapply(m[ , "x1"], m[ , "id"], function(x) mean(range(x)))
          ys <- tapply(m[ , "x2"], m[ , "id"], min)
          plot(g, layout = m, rescale = F, xlim = c(0.5, 21.5), vertex.size = 20,
          vertex.label = NA, edge.color = "black", vertex.color = "black")
          text(xs, ys - 0.6, LETTERS[1:3])


          enter image description here







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 22 '18 at 16:05

























          answered Nov 21 '18 at 23:45









          HenrikHenrik

          42.1k994110




          42.1k994110








          • 1





            Thanks for answer. This is a very good solution.

            – Piotr Wilczek
            Nov 22 '18 at 0:27














          • 1





            Thanks for answer. This is a very good solution.

            – Piotr Wilczek
            Nov 22 '18 at 0:27








          1




          1





          Thanks for answer. This is a very good solution.

          – Piotr Wilczek
          Nov 22 '18 at 0:27





          Thanks for answer. This is a very good solution.

          – Piotr Wilczek
          Nov 22 '18 at 0:27




















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