CODEWITHSUNDEEP
rplotequation
Guest
Guest

Reputation: 17

How do I graph my equation in R

I have the following equation that I would like to graphy for y values between 0 - 20. However I am not sure how to set the data up to use the function plot (x,y).

I first defined my y values as:

y <- data.frame(x = c(1:20))

And then my x values as: 

x<- (exp (-1.973 + 0.598*y) )/ (1+ exp (-1.973+ 0.598*y))

I get back this error when using plot(x,y)

Erreur dans stripchart.default(x1, ...) : méthode graphique incorrecte (error in stripchart: method graphic incorrect)

any tips?

Upvotes: 0

Views: 1764

Answers (3)

Jot eN
Jot eN

Reputation: 6396

You could simply create a data.frame object with y and x value, and afterwards plot it. 

y <- c(1:20)
x <- exp (-1.973 + 0.598*y) / 1+ exp (-1.973+ 0.598*y)
df <- data.frame(y = y, x = x)
plot(df$y, df$x)

Upvotes: 1

plannapus
plannapus

Reputation: 18749

If you want to draw the equation exp(-1.973+0.598*x)/(1+exp(-1.973+0.598*x)) on the range [0,20], the simplest is to use function curve, this way you don't have to define a y or an x vector since it takes an expression directly:

curve(exp(-1.973+0.598*x)/(1+exp(-1.973+0.598*x)),from=0,to=20)

Upvotes: 1

Sven Hohenstein
Sven Hohenstein

Reputation: 81683

Since both x and y are data frames, you have to extract the first column with [[ before plotting.

plot(x[[1]], y[[1]])

Upvotes: 0

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