Why the plot code wont work ? check codes below! HELP ME PLEASE

g=9.81;
Q = app.Qm3sEditField.Value;
b = app.bmEditField.Value;
q = Q/b;
for j=1:length(q)
yc=(q(j)^2/g)^(1/3);
Depth = [0.5*yc 0.6*yc 0.7*yc 0.8*yc 0.9*yc yc 1.1*yc 1.2*yc 1.5*yc 1.9*yc];
Eprime = [];
for i=1:length(Depth)
E(i,j) = y(i)+q(j)^2/(2*g*y(i)^2);
Eprime = [Eprime E(i,j)];
end
end
plot(app.UIAxes,Eprime,Depth,'or','MarkerFaceColor','r');
hold (app.UIAxes,'on')

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Q = app.Qm3sEditField.Value;
b = app.bmEditField.Value;
Do we know for sure that those are not empty? Check their sizes
I wrote this in script and it worked but i need in appdesigner , why would they be empty ?
Using your app designer version put a breakpoint in at
q = Q/b;
and show us size(Q) and size(b) there. You will be at the K>> debugging prompt when you do that.

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