how to select corresponding values to a column

I have a data set with x and y...like 100 each in a column...x is a number..y is a value of a paramter

for x i have selected specific values say i have selected 1,15,30,45,60,75,90,100

now i want matlab to select corresponding values of y that are to x...

i know its simple but am dealing with something complex..juts need to know the quick answer. Thanks

Answer 1

[David Hill]

yourMatrix=[(1:100)',randi(100,100,1)];
y=yourMatrix([1,15,30,45,60,75,90,100],2);

[Usama Bin Khalid]

I didnt mean this..Ok so let me re-question:

the data i have is:

A B

213 0.028698539

213.1 0.028679289

213.2 0.028659992

213.3 0.028640648

213.4 0.028621256

213.5 0.028601818

213.6 0.028582333

213.7 0.028562802

213.8 0.028543223

213.9 0.028523599

214 0.028503928

214.1 0.02848421

214.2 0.028464446

214.3 0.028444637

214.4 0.028424781

214.5 0.028404879

214.6 0.028384932

214.7 0.028364938

214.8 0.028344899

214.9 0.028324815

215 0.028304685

215.1 0.02828451

215.2 0.028264289

215.3 0.028244024

215.4 0.028223713

215.5 0.028203357

215.6 0.028182957

215.7 0.028162512

215.8 0.028142022

215.9 0.028121487

216 0.028100908

and this data goes until 1000. I wanted to extract some values of A and its corresponding values in col B

A: 213,213.5,213.8,214.3,214.6,215.31and so on..

i did this:

x=repmat([0.3 0.5],1,5)

x(1)=213

x=cumsum(x)

now i have one column with these values of A

x = 1×10

213.0000 213.5000 213.8000 214.3000 214.6000 215.1000 215.4000 215.9000 216.2000 216.7000

I want to now select values of B corresponding to these!!!

[David Hill]

yourMatrix=[(1:100)',randi(100,100,1)];
y=yourMatrix(ismember(yourMatrix(:,1),[1,15,30,45,60,75,90,100]),2);