[R] Reading a set of values from a numeric matrix

[Srinivas Iyyer]

Dear group, 
I have a matrix with (190,20000) dimensions. 

The values range from : -973.8149  to 807.4688 

I want to select the values less than -200 and want to
know what are the names of row and columns. 

   m1 m2 m3 m4 ...... mn
k1
k2
k3
k4
.
.
.
kj



>mymat[1:4,1:4]

       1-Dec       1-Mar      1-Sep     10-Sep
m1  -0.4220701 -0.94359666 -421.06729 -1.8525286
m2   0.4408303 -250.706960  0.6422206  0.6344322
m3   0.4005077 -430.076784  1.3653584  0.4677905
m4   5.0358915  6.40544709 -430.67964  3.2017410


I want to select the pairs:

m2 1-Mar   -250.706960
m3 1-Mar   -430.076784
m1 1-Sep   -421.06729
m4 1-Sep   -430.67964


How can I do it.  Could any one help me out. Please. 

Thanks
sri