不同的迭代输出

发布于 2024-10-31 16:26:05 字数 442 浏览 6 评论 0原文

我在 matlab 中有这个

A=34;
for i =1:1:6
    A = A + 1;
t1=fix(A/(2*32));
t2=fix((A-(t1*64))/(32));
t3=fix(((A-(t1*64)) - (t2*32))/(16));
G = [t1 t2 t3]
end

,当它显示时,它给出

G= 0 1 0
G= 0 1 0
G= 0 1 0 ....to the 6th G(the values are not right anyway)
but I want to have an output of
G1= 0 1 0
G2= 0 1 0
G3= 0 1 0....to G6 

然后 cat.or 将它们放入一组 G = [G1, G2, G3, ...,G6] 中。请问我该如何完成此操作?

I have this in matlab

A=34;
for i =1:1:6
    A = A + 1;
t1=fix(A/(2*32));
t2=fix((A-(t1*64))/(32));
t3=fix(((A-(t1*64)) - (t2*32))/(16));
G = [t1 t2 t3]
end

When it displays, it gives

G= 0 1 0
G= 0 1 0
G= 0 1 0 ....to the 6th G(the values are not right anyway)
but I want to have an output of
G1= 0 1 0
G2= 0 1 0
G3= 0 1 0....to G6 

and then cat.or put them into a set of G = [G1, G2, G3, ...,G6].Please how do I get this done?

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评论(2

静若繁花 2024-11-07 16:26:05

关于您的问题,有几点需要解决...

预分配数组和矩阵索引:

如果您想保存每次迭代生成的值,您可以 在循环之前将数组预分配为 6×3 零矩阵,然后 在循环中索引到矩阵的给定行以存储值:

A = 34;
G = zeros(6, 3);  % Make G a 6-by-3 matrix of zeroes
for i = 1:6
  % Your calculations for t1, t2, and t3...
  G(i, :) = [t1 t2 t3];  % Add the three values to row i
end

矢量化运算:

在许多情况下,您可以在 MATLAB 中完全避免 for 循环,并且通常可以通过使用 矢量化操作。在您的情况下,您可以为 A 创建一个值向量,并对 t1t2t3 执行计算code> 使用 算术数组运算符 < code>.* 和 ./

>> A = (35:40).';   %' Create a column vector with the numbers 35 through 40
>> t1 = fix(A./64);  % Compute t1 for values in A
>> t2 = fix((A-t1.*64)./32);         % Compute t2 for values in A and t1
>> t3 = fix((A-t1.*64-t2.*32)./16);  % Compute t3 for values in A, t1, and t2
>> G = [t1 t2 t3]  % Concatenate t1, t2, and t3 and display

G =

     0     1     0
     0     1     0
     0     1     0
     0     1     0
     0     1     0
     0     1     0

这里的好处是 G 将自动以包含您想要的所有值的 6×3 矩阵结束,因此不需要预分配或索引。

显示输出:

如果要创建与在行尾省略分号时出现的默认数字显示不同的格式化输出,可以使用诸如 fprintf。例如,要获得您想要的输出,您可以在创建 G 后运行它,如下所示:

>> fprintf('G%d = %d %d %d\n', [1:6; G.'])  %' Values are drawn column-wise
G1 = 0 1 0                                   %   from the second argument
G2 = 0 1 0
G3 = 0 1 0
G4 = 0 1 0
G5 = 0 1 0
G6 = 0 1 0

There are a few points to address regarding your question...

Preallocating arrays and matrix indexing:

If you want to save the values you generate on each iteration, you can preallocate the array G as a 6-by-3 matrix of zeroes before your loop and then index into a given row of the matrix within your loop to store the values:

A = 34;
G = zeros(6, 3);  % Make G a 6-by-3 matrix of zeroes
for i = 1:6
  % Your calculations for t1, t2, and t3...
  G(i, :) = [t1 t2 t3];  % Add the three values to row i
end

Vectorized operations:

In many cases you can avoid for loops altogether in MATLAB and often get a speed-up in your code by using vectorized operations. In your case, you can create a vector of values for A and perform your calculations for t1, t2, and t3 on an element-wise basis using the arithmetic array operators .* and ./:

>> A = (35:40).';   %' Create a column vector with the numbers 35 through 40
>> t1 = fix(A./64);  % Compute t1 for values in A
>> t2 = fix((A-t1.*64)./32);         % Compute t2 for values in A and t1
>> t3 = fix((A-t1.*64-t2.*32)./16);  % Compute t3 for values in A, t1, and t2
>> G = [t1 t2 t3]  % Concatenate t1, t2, and t3 and display

G =

     0     1     0
     0     1     0
     0     1     0
     0     1     0
     0     1     0
     0     1     0

The bonus here is that G will automatically end up as a 6-by-3 matrix containing all the values you want, so no preallocation or indexing is necessary.

Displaying output:

If you want to create formatted output that differs from the default display of numbers that occurs when you leave off the semicolon at the end of a line, you can use functions like fprintf. For example, to get the output you want you could run this after creating G as above:

>> fprintf('G%d = %d %d %d\n', [1:6; G.'])  %' Values are drawn column-wise
G1 = 0 1 0                                   %   from the second argument
G2 = 0 1 0
G3 = 0 1 0
G4 = 0 1 0
G5 = 0 1 0
G6 = 0 1 0
海夕 2024-11-07 16:26:05

如果我理解正确的话,你的问题只是输出(以便所有值都存储在 G 中),对吧?

你可以尝试这个:

lowerbound = (i-1)*3 + 1;
G(lowerbound:lowerbound + 2) = [t1 t2 t3]

这应该用新计算的值扩展 G

If I understood you correctly your problem is just the output (so that all values are stored in G), right?

You might try this:

lowerbound = (i-1)*3 + 1;
G(lowerbound:lowerbound + 2) = [t1 t2 t3]

This should expand G with the newly computed values

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