[R] lm function - strange error

[tesssa]

I am following a document teaching how to use regression and right at the
onset I get an R error.  I understand that variables "conc" and "signal"
should have the same length but  I am using the what R manual suggests to
drop the error and it is not cooperating.  What gives?   The manual says
that the default is na.ombit by the way, not that it's addition does
anything

How do I make it omit the extra items?  I want to follow this document  but
it seems that R has changed since that one was written 

Here is the code

conc = c(0 10 20 30 40 50)
signal = c (4, 22, 44, 60, 82)
lm( signal ~ conc)

#Error in model.frame.default(formula = signal ~ conc, drop.unused.levels =
TRUE) : 
#variable lengths differ (found for 'conc')


lm (conc~signal, na.action=na.omit)
#Error in model.frame.default(formula = conc ~ signal, na.action = na.omit, 
: 
#variable lengths differ (found for 'signal')


lm (conc~signal, na.action=na.exclude)
#Error in model.frame.default(formula = conc ~ signal, na.action =
na.exclude,  : 
#variable lengths differ (found for 'signal')




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