How to define rule of rules?

[Peng Yu]

I need to define many rules like RData_rule, png_rule, csv_rule, ....

Is there a way to define a macro that can define these rules (with the
parameter like RData and png)?

define RData_rule
TARGET:=$(patsubst %.R,%.RData,$1)
all: $$(TARGET)
$$(TARGET): $1 $2 $3 $4 $5 $6 $7 $8
        Rscript $$<

endef

define png_rule
TARGET:=$(patsubst %.R,%.png,$1)
all: $$(TARGET)
$$(TARGET): $1 $2 $3 $4 $5 $6 $7 $8
        Rscript $$<

endef

-- 
Regards,
Peng