# how do you program matlab to select a number that wasn't presented in the stimuli? 50/50 between presented and not presented numbers for the Sternberg Task

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Michael Davies on 8 Dec 2017
Commented: Michael Davies on 19 Dec 2017
rng('Shuffle'), ([a b c d e]) a = randperm(10, 5)-1 %length(a) for k=1:length(a) clf;text(0.5,0.5, num2str(a(k)),'FontSize',75);axis off; pause(1) clf; end for x1 = randsample(a,1), pause(2) clf;text(0.5,0.5, num2str(x1),'Fontsize',75);axis off end
So far the code i am using only selects a number that was presented but not a number that wasn't. Can anyone please help me solve this problem?

Amy on 12 Dec 2017
Hi Michael,
If you look at the documentation for the randsample function, you will see the following:
" y = randsample(population,k) returns a vector of k values sampled uniformly at random, without replacement, from the values in the vector population. "
So this means when you write:
x1 = randsample(a,1)
'x1' will only ever be assigned a value from a. If you want 'x1' to be any value from 1 to 10, you would just replace 'a' with 10:
x1 = randsample(10,1)
Michael Davies on 19 Dec 2017
Hi Amy, thank you so much for your help!!