MATLAB: How to eliminate certain data from a set of 300 x 4 data

dataplot

Hi, Dear community
HI have a set of 300 x 4 data and I'm required to plot a data of NOP vs Scores which only when x = 0.05 and y = 0.5 Here is some of my data –
What codes should I use? I have no idea on how to choose value score and nop when only x = 0.05 and y = 0.5 .
Will appreacite your help ^^ Thankyou in advance.

Best Answer

A=[x' y' scores' Nop'];  
id=x==0.05 & y==0.5
out=A(id,:)
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