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POReordering a character column values for plotting
 

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  1. POReordering a character column values for plotting
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    <p>Following is a subset of the dataframe I have:</p> <pre><code>sample &lt;- structure(list(MONTH_DAY = c("1_0", "1_1", "1_10", "1_11", "1_12", "1_13", "1_14", "1_15", "1_16", "1_17", "1_18", "1_19", "1_2", "1_20", "1_21", "1_22", "1_23", "1_3", "1_4", "1_5", "1_6", "1_7", "1_8", "1_9", "2_0", "2_1", "2_10", "2_11", "2_12", "2_13", "2_14", "2_15", "2_16", "2_17", "2_18", "2_19", "2_2", "2_20", "2_21", "2_22", "2_23", "2_3", "2_4", "2_5", "2_6", "2_7", "2_8", "2_9", "3_0", "3_1"), variable = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L), .Label = c("9", "10", "11", "12", "13"), class = "factor"), value = c(NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 51, 18 )), .Names = c("MONTH_DAY", "variable", "value"), row.names = c(NA, 50L), class = "data.frame") </code></pre> <p>I am plotting a graph using <code>ggplot2</code> with x-axis being of the format MONTH_DAYOFMONTH i.e. 1_13 means it January and 13th of the same month, y axis indicating a count (which is <code>value</code> column in the dataframe). When I plot the data, using the command: </p> <pre><code>ggplot(sampleData, aes(x=MONTH_DAY, y=value, colour=variable, group=variable)) + `geom_line() + theme(axis.text.x=element_text(angle=90, size=4, hjust=-0.2, vjust=0.5)) + scale_colour_discrete("Months")` </code></pre> <p>the x-axis is not sorted and displays the starting with the x-axis values being <code>1_0, 1_1, 1_10, 1_11</code> ... instead of <code>1_0, 1_1, 1_2, 1_3</code>.</p> <p>How can I sort such values so that the plot shows the data is the order I would like to see? </p>
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    1. COThis is related conceptually to another question you had asked: http://stackoverflow.com/q/15370042/1270695. Review my comments to your main question there for the solution.
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    2. COI would convert `MONTH_DAY` to a factor, using `factor()`, supplying the desired order in the `levels` argument.
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      1. POReordering a character column values for plotting
      1. USTheodore Lytras
    3. COWhat month day is `1_0`?
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      1. USSimon O'Hanlon
 

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