R2020b Matlab Editor is running very slow

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Mostafa Abotaleb 2021-7-22

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https://ww2.mathworks.cn/matlabcentral/answers/884139-r2020b-matlab-editor-is-running-very-slow

编辑： dpb 2021-7-24

Trapezoidal.m

Good day everyone,

Please, I wish if someone can kindly help me to solve the following problem. I wrote the code in the attached file on Matlab R2020a to generate a trapezoidal wave, then analyze it , it was running perfectly, then suddenly when I started to run the code, it sarted to take an extemely long time to finsh the running process. I tried to check if the problem is from my lap top, that's why, I ran the same code on another lap top with a different matlab version R2017b , however the result was the same and the running time can be up to two or three hours. I wish if someone can kindly offer some help as soon as possible .

Thank you so much .

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Mostafa Abotaleb 2021-7-24

编辑：dpb 2021-7-24

在 MATLAB Online 中打开

clc;
f=input('enter the frequency ...');
x = 0:0.000001:10;
y1 = 1*(asind(sin((2*pi*f)*x+1)))-0.5;
y2 = 1*(asind(sin((2*pi*f)*x+1))+acosd(cos((2*pi*f)*x+1)))-1/2;
y3 = 1*(acosd(cos((2*pi*f)*x+1)))-1/2;
massimo = max(y2);
minimo = min(y2);
y4 = y2/massimo;
subplot(4,1,1);
plot(x,y1);
subplot(4,1,2);
plot(x,y2);
subplot(4,1,3);
plot(x,y3);
y7 = y4;
for dd=1:length(y4)
  if y4(dd)<0
    y4(dd)= 0;
  end
end
subplot(4,1,4);
plot(x,y4);
figure;
plot(x,y4);
y5 = y4;
y6 = y4;
for uu = 1:length(y4)
  tt = uu + 1
  if tt < length(y4)
    subtra = y4(uu) + y4(tt);
    if subtra >= 1 && subtra < 2; 
      y4(uu) = sym(y4(uu));
    end
  end
end
counterones = 0;
counterzeros = 0;
fc1 = [];
fc0 = [];
insert1 = 0;
insert0 = 0;
for ww = 1:length(y4)
    qq = ww + 1;
    if qq < length(y4)
      if y4(ww)==1 && y4(qq) == 1 
        counterones = counterones + 1
      end
      if y4(ww)==0 && y4(qq)==0 
        counterzeros = counterzeros + 1
      end
      if y4(ww)==1 && y4(qq)<1
        insert1 = counterones + 1;
        counterones =0;
        fc1 = [fc1 insert1];
      end
      if y4(ww)==0 && y4(qq)>0
        insert0 = counterzeros + 1;
         counterzeros =0;
        fc0 = [fc0 insert0];
      end
    end
    insert0 = 0;
    insert1 = 0;
end

dpb 2021-7-24

编辑：dpb 2021-7-24

在 MATLAB Online 中打开

for uu = 1:length(y4)
  tt = uu + 1
  if tt < length(y4)
    subtra = y4(uu) + y4(tt);
    if subtra >= 1 && subtra < 2; 
      y4(uu) = sym(y4(uu));
    end
  end
end

subtra=sum([y4(1:end-1);y4(2:end)]);
ix=(subtra>=1) && (subtra<2); 
y4(uu) = sym(y4(uu));

but I still don't see the point/purpose of any of it.

It just looks like an effort to code sign in a round about way to me. What's the point of the addition of the two adjacent elements instead of just using the signal itself?

dpb 2021-7-24

编辑：dpb 2021-7-24

Maybe what you're looking for instead of round or fix is ceil...but it's not clear just what the intent is/what the problem is that you're trying to cure.

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