为什么for分支里的程序不运行

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clc;clear;%鍑芥暟浣灭敤鏄剧ず婊¤冻𨱒′欢镄勭偣%
Alpha=linspace(-pi/6,pi/6,100);%鍒涘缓涓缁存暟缁
Beta=linspace(-pi/6,pi/6,100);
ZP=linspace(0.10,0.40,100);
N=0;
M=0;
P=0;
Q=0;
fori=1:length(Alpha)%涓轰綍寰鐜娌℃湁杩愯岋纻
forj=1:length(Beta)
fork=1:length(ZP)
theta11=cos(Alpha(i))+sin(Beta(j))+1/2*ZP(k);
theta12=sin(Beta(j))+cos(Alpha(i))+ZP(k);
theta13=sin(Beta(j))*cos(Alpha(i))-ZP(k);
J=[cos(Alpha(i))sin(Beta(j))ZP(k)sin(Beta(j))cos(Alpha(i))1/2*ZP(k)sin(Alpha(i))*cos(Beta(j))cos(Alpha(i))*ZP(k)sin(Beta(j))*ZP(k)];
if(theta11>=pi/4)&&(theta11<=(3*pi)/4)&&(theta12>=pi/4)&&(theta12<=(3*pi)/4)&&(theta13>=pi/4)&&(theta13<=(3*pi)/4)&&(det(J)~=0);
disp(theta11);
disp(theta12);
disp(theta12);
disp(J);
N=N+1;%缁熻℃弧瓒虫浔浠剁殑镣逛釜鏁
figure(1);
plot3(Alpha(i),Beta(j),ZP(k));
holdon;
end
M=M+1;
end
P=P+1;
end
Q=Q+1;
end
display(num2str(N));%num2str(N)灏嗘暟鍊煎彉閲忚浆鍖栦负瀛楃︿覆%
display(num2str(M));
display(num2str(P));
display(num2str(Q));

缁撴灉锛

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