index matrix exceeds dimensions ?! svm

Hello , i'm new to matlab trying to write simpler code based on svm fisheriris

i'm writing for simple data whcih is phone detector by having 12 phone as a data.

i'm gettig error regarding dimesnsion in last 4 lines of my code ,and i don't see my index matrix has any problem!!! i'll be grateful if someone helps

%%prepare data set

load pashmak

species_num = grp2idx(species); % converting data phone type to number set

X=meas(1:12.); y=species_num(1:12.);

%writing code to create train data data

trainx=(200:0.5:450) ;

x=cell(1,100);

for j=1:100

x{1,j}=trainx(randi([1 numel(trainx)],1));

end

cell2mat(x) % 100 test data has been made

trainy=(1:1:12) ;

yb=cell(1,100);

for j=1:100

yb{1,j}=trainy(randi([1 numel(trainy)],1));

end

cell2mat(yb) % 100 test data has been made

ran=randperm(100);

X_train = x(ran(1:80),:);

y_train = yb(ran(1:80),:);

X_test = x(ran(81:end),:);

y_test = yb(ran(81:end),:);