从R中的矩阵绘制列 [英] Plotting columns from a matrix in R

问题描述

我从模拟中创建了一个值矩阵，该矩阵存储在20x7矩阵中(在7列数字中有20个观察值；该矩阵称为输出).列是从模拟输出的.

I've created a matrix of values from a simulation that is stored in 20x7 matrix (20 observations across 7 columns of numbers; the matrix is called output). The columns are output from a simulation.

运行模拟后，我添加了列名:

After running the simulation, I included column names:

colnames(output) <- c('level', 'value1','value2','value3',
                         'value4','value5','value6')

并且矩阵看起来很干净.观察时:

And the matrix looks nice and clean. when observing:

output  

有没有一种方法可以从矩阵中绘制这些列?我已经尝试了下面的代码(和其他变体)，但是它不起作用.

Is there a way to plot these columns from the matrix? I've tried the code below (and other variants), but it will not work.

 plot(level$output, value1$output)

谢谢！

推荐答案

要为矩阵建立索引，请使用output[,'level']，即任意行，'级别'列".

To index the matrix you use output[,'level'], i.e. "any row, the 'level' column".

plot(output[,'level'],output[,'value1'])

出于您的兴趣，您还可以从矩阵制作数据框并进行如下绘制:

For your interest, you could also make a data frame from your matrix and plot like so:

df <- data.frame(output)
plot(value1 ~ level,df)

如果您对output所做的全部工作都是不值得做的，但是如果您正在R中对output进行其他类型的分析，则数据框可能会很方便(然后您可以引用，output$value1，而使用矩阵则必须执行output[,'level']).

Not worth doing if all you are doing with output is plotting, but if you are doing other sorts of analysis on output in R, a dataframe can be handy (and then you can refer to columns like output$level, output$value1 whereas with a matrix you have to do output[,'level']).

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