value y error with gnuplot. I can't see it

Question

I have these error in gnuplot code: "line 0: all points y value undefined!"

The conf is:

set datafile separator ","
set terminal png
set xdata time
set terminal png size 1024,768
set autoscale y
set output "kk.png"
set timefmt "%Y/%m/%d"
set xrange ["12/04/2015":"12/05/2015"]
plot './datos_2978.dat' using 1:2 title 'cpu' with line

And data:

12/04/15,28
27/04/15,25
05/05/15,17
11/05/15,16

Could you help me please? Thanks

Answer 1

I solved the problem. I missed set yrange[xxx:yyyy].

Answer 2

Looks to me that your timefmt string is incorrect, you are setting "%Y/%m/%d", but the data is "%d/%m/%Y".

Furthermore you should define your xrange like this:

set xrange ["12/04/15":"12/05/15"]