Delete the equal sign in the xlabel, ylabel, and title calls —
A_full = rand(1,570);
B_30_channels = rand(1,570);
figure
scatter(A_full,B_30_channels, 'blue') % A and B are both rows of 570 values each
hold on
ylabel('30 chan')
xlabel('128 chan')
title('scatter of 30 vs 128 channel band power means')
.
