[R] If equal statement for character objects

[cm]

I have a data frame (trans)
123     P
143     z   ...ect

I want to write a statement that says:
if ((trans[i,2]="p")&(trans[1+1,2]="z")){....

but I get the warning message that states:
 operations are possible only for numeric, logical or complex types

Any ideas?
Thanks



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