CSC121 - R Console
Monday March 5th
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> # Plotting (from lecture slides)
> 
> plot (c(), xlim=c(0,2), ylim=c(1,5))
> plot (c(), xlim=c(0,2), ylim=c(1,5))
> # If plot window too small, you will get an error:
Error in plot.new() : figure margins too large
In addition: Warning messages:
1: In doTryCatch(return(expr), name, parentenv, handler) :
  display list redraw incomplete
2: In doTryCatch(return(expr), name, parentenv, handler) :
  invalid graphics state
3: In doTryCatch(return(expr), name, parentenv, handler) :
  invalid graphics state
> plot (c(), xlim=c(0,2), ylim=c(1,5))
> 
> x <- c(3, 4, 5)
> y <- c(1, 2, 3)
> points(x, y, col="red", pch=20)
> plot (c(), xlim=c(0,7), ylim=c(0,5))
> points(x, y, col="red", pch=20)
> z <- c(5, 3, 1)
> lines(z, col="green", lty="dotted")
> lines(z, col="blue", lty="dotted")
> points(z, col="blue", pch=20)
> points(z, col="blue", pch=21)
> x <- 1:10
> y <- x^2
> plot(x,y,xlim=c(0,11))
> text(x,y+2,paste("square of",x))
> source('~/.active-rstudio-document')
> source('~/.active-rstudio-document')
> source('~/.active-rstudio-document')
> text(x,y+2,paste("square of",x))
TEXT_SHOW_BACKTRACE environmental variable.
> 
> # Often in disciplines like physics or economics, you're going to want to model mathematical functions
> # Now, the default x coordinates are the natural numbers: 1, 2, 3...
> # But we know that functions are:
>    # continuous: we define functions over the real numbers
> # Obviosuly, we can't store infinite real numbers in the computer
> # But we also don't always want to just have the natural numbers as our x coordinate
> # For example, what if we wanted to just the value of the function from 0 to 1
> # When you usually want to plot a function, you should define your x coordinates
> 
> # For example: I want the values from 0 to 1, separated by 0.1 each
> # 0, 0.1, 0.2, .... 1.0 
> seq(0, 1, 0.1)
 [1] 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
> # Let's say I want x^2, 0 <= x <= 1.0
> x <- seq(0, 1, 0.1)
> x
 [1] 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
> plot(x, x^2)
> plot(x^2)
> # Without specifying x as the x-coordinates, we get the natural numbers as our x-values, and not the original x values from the vector
> plot(x, x^2)
> plot(x, x^2, type="l")
> x <- seq(0, 1, 0.01)
> length(x)
[1] 101
> plot(x, x^2, type="l")
> x <- seq(0, 1, 0.2)
> plot(x, x^2, type="l")
> x <- seq(0, 1, 0.00001)
> length(x)
[1] 100001
> plot(x, x^2, type="l")
>