Make first and last element of array 0

Question

Sarah Gomez 2022-2-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1659760-make-first-and-last-element-of-array-0

评论： Stephen23 2022-3-21

N = 12*0.5;
TAU_max = 15;
for i = 1:N
TAU(i,:) = i*(TAU_max/N);
end 

I have a little loop here that creates a column vector with my dummy variables. But how I do make it so the (1,1) and (1:N) elements are 0 while still preserving my original values?

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Stephen23 2022-3-21

在 MATLAB Online 中打开

You don't need a loop:

N = 12*0.5;
TAU_max = 15;
TAU = (1:N)*(TAU_max/N)
TAU = 1×6
    2.5000    5.0000    7.5000   10.0000   12.5000   15.0000

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Voss 2022-2-28

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1659760-make-first-and-last-element-of-array-0#answer_905905

编辑：Voss 2022-2-28

在 MATLAB Online 中打开

Pre-allocate TAU as a vector of zeros, then just set elements 2 through N-1:

N = 12*0.5;
TAU_max = 15;
TAU = zeros(N,1); % pre-allocate
for i = 2:N-1
    TAU(i,:) = i*TAU_max/N;
end
disp(TAU);
         0
    5.0000
    7.5000
   10.0000
   12.5000
         0

Alternatively, set all elements and afterward set elements 1 and N to zero:

N = 12*0.5;
TAU_max = 15;
TAU = zeros(N,1);
for i = 1:N
    TAU(i,:) = i*TAU_max/N;
end
TAU([1 N],:) = 0;
disp(TAU);
         0
    5.0000
    7.5000
   10.0000
   12.5000
         0

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Arif Hoq 2022-2-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1659760-make-first-and-last-element-of-array-0#answer_905900

编辑：Arif Hoq 2022-2-28

在 MATLAB Online 中打开

try this:

N = 12*0.5;
TAU_max = 15;
for i = 1:N
TAU(i,:) = i*(TAU_max/N);
TAU([1 N],:)=0;
end 
disp(TAU)
         0
    5.0000
    7.5000
   10.0000
   12.5000
         0