Problem with bar plot

Hi, I'd appreciate some help with an issue I'm having. When creating a bar plot using the following:
barplot(table(Mydata$MsType, Mydata$Rel1yPre), ylim=c(0,90),
col=c("navyblue", "seagreen", "tomato3"),
xlab="Number of Relapses 1y Pre diagnosis",
main="Type of MS vs. Number of Relapses 1 year prior to Diagnosis",
legend.text=c("PPMS", "RRMS", "SPMS"),

I've realised that for some reason the value of the variables is assigned depending on the order I put it in, which results in incorrect data being shown on the plot. For example, if I put "RRMS", "PPMS", "SPMS" (instead of the above) the plot simply changes the colours and incorrectly shows the frequency of RRMS as belonging to PPMS. I've only noticed because I know my data and I'm worried im getting incorrect plots!
I'm clearly doing something wrong - I'm still a beginner so I'd appreciate it if someone could guide me as to what the issue is.

This topic was automatically closed 21 days after the last reply. New replies are no longer allowed.

If you have a query related to it or one of the replies, start a new topic and refer back with a link.

Thank you for your reply! I'm not sure whether I understood you correctly, do you mean saving as a table first?
is this what you mean?:
relapses<-table(Mydata$MsType, Mydata$Rel1yPre)
barplot(relapses, main="Type of MS vs. Number of Relapses 1 year prior to Diagnosis", col=c("navyblue", "seagreen", "tomato3"),