[英]issue working with 3d arrays in matlab
First Question
: First Question
: regarding my code here : 关于我的代码:
for z = [1 2 4 8 12 16 24 32 64 96 128]
for a=1:24
a;
for d=1:5
d;
[result]=evolRand(128,1,10,1,bench);
bb= 5*(a-1)+d;
temp=eval(['minExe_useModel_' num2str(z)]);
%z=num2str(zz)
exploreff(a,d,z) =mean(mean(result(a,d).randMin(:,2:end)))/temp(bb);
end
end
end
why at the end I am getting : 为什么最后我得到:
>>size(exploreff)
ans =
24 5 128
while I had assigned z= [1 2 4 8 12 16 24 32 64 96 128]
which was 11
?? 虽然我已经指定
z= [1 2 4 8 12 16 24 32 64 96 128]
这是11
??
Second Question
: Second Question
: How am I gonna be able to define a array of structure out of these z so that I can call them like exploreff(a,b).z
? 我怎么能从这些z中定义一个结构数组,以便我可以像
exploreff(a,b).z
一样调用它们? cuz defining them like this in the script caused the cuz在脚本中定义它们就像这样导致了
Structure assignment to non-structure object.
Error in explorationEffort_Speedup (line 15)
exploreff(aa,dd).z=mean(mean(result(aa,dd).randMin(:,2:end)))/temp(bb);`
error. 错误。
Firstly, 首先,
exploreff(a,d,z)
uses a
, d
and z
as indices , therefore you're assigning 11 values to the 1st, 2nd, 4th, ... 96th and 128th indices along the 3rd dimension. 使用
a
, d
和z
作为索引 ,因此您要沿第3维向第1,第2,第4,......第96和第128个索引分配11个值。 Matlab automatically expands (and zero-fills) the array when you assign to an index outside its current dimensions, hence why the 3rd dimension ends up at 128 elements long. 当您分配到当前维度之外的索引时,Matlab会自动扩展(并填充零)数组,因此第三维最终会以128个元素长度结束。
Secondly, if exploreff
is preallocated as a numeric array you can't just start addressing it as a structure. 其次,如果将
exploreff
预先分配为数字数组,则不能仅将其作为结构进行寻址。 If you preallocate it as a struct array (using struct
) first, then dynamically expanding it and adding fields in that way should be ok (I only have Octave to test, and that lets me do eg a(2,3).z = 5
straight off but I seem to recall Matlab wanting either the index or the field to exist first - that was 2007a though...). 如果你首先将它预先分配为结构数组(使用
struct
),那么动态扩展它并以这种方式添加字段应该没问题(我只有Octave来测试,这让我做了例如a(2,3).z = 5
直接但我似乎记得Matlab想要索引或字段首先存在 - 那是 2007a虽然......)。
I think this is what you want to do... 我想这就是你想做的......
z = [1 2 4 8 12 16 24 32 64 96 128];
for i = 1:length(z)
for a=1:24
a;
for d=1:5
d;
[result]=evolRand(128,1,10,1,bench);
bb= 5*(a-1)+d;
temp=eval(['minExe_useModel_' num2str(z(i))]);
%z=num2str(zz)
exploreff(a,d,z(i)) =mean(mean(result(a,d).randMin(:,2:end)))/temp(bb);
end
end
end
exploreff(a,d,z==8)
Note that z
in the loop is replaced by z(i)
. 请注意,
z
在循环被替换为z(i)
Instead of directly specifying the value you want, you need to specify the index of the element. 您需要指定元素的索引,而不是直接指定所需的值。 In the last line,
z==8
specify the index of the element in vector z
that has 8
value. 在最后一行中,
z==8
指定向量z
中具有8
值的元素的索引。
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