how can i add more than two elements to an array ?

if i have

x=[1,2,3,4]
syms t
i=1 ;
for i=1:3
switch x(i)
case 1
  x1=cos(t)
case 2
  x2=sin(t)
case 3
  x3=sin(2t)
  end
i=i+1
end

i want to have array x that contains y=[x1,x2,x3]

so x=[cos(t),sin(t),sin(2t),cos(7t)]

i want a method to this operation because i want to use it in a loop or switch ?

how can i do this in MATLAB ?

Answer 1

[Walter Roberson]

syms t
x1=cos(t)
x2=sin(t)
x3=sin(2*t)
x4=cos(7*t)
x = [x1, x2, x3, x4]

[Eng Abeer]

thanks but i want a method to do this if i have a loop i can't use x = [x1, x2, x3, x4] is there any method do this ?

[Walter Roberson]

x=[1,2,3,4]
syms t
for i=1:length(x)
  switch x(i)
    case 1
      v = cos(t);
    case 2
      v = sin(t);
    case 3
      v = sin(2*t);
    case 4
      v = cos(7*t);
  end
  y(i) = v;
end

[Eng Abeer]

Thanks ... it is very useful way

x=[1,2,3,4];

y=[];

syms t

for i=1:length(x)

    switch x(i)

      case 1

        v = cos(t);

      case 2

        v = sin(t);

      case 3

        v = sin(2*t);

      case 4

        v = cos(7*t);

    end

     y=cat(2,y,x) ;

end

can i use this y=cat(2,y,x) or it will be wrong ??

[Walter Roberson]

y = cat(2,y,x) should work. Most people would instead write y = [y,x] or y = horzcat(y,x) . But better yet is to use indexing and an initialized matrix

y = sym(zeros(1,length(x));

...

y(i) = v;

[Eng Abeer]

Thanks...