left and right sides have a different number of elements.

Question

Luca Re 2024-6-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2125966-left-and-right-sides-have-a-different-number-of-elements

编辑： Stephen23 2024-6-6

matlab_3Variable.mat

Hi, i've this problem
i is a logical 5995x1... price and bubu have equal size
load('matlab_3Variable.mat');
 price(i)=bubu;
Unable to perform assignment because the left and right sides have a different number of elements.

6 个评论
显示 4更早的评论隐藏 4更早的评论

Stephen23 2024-6-6

在 MATLAB Online 中打开

matlab_3Variable.mat

"price and bubu have equal size"

That is irrelevant. What is relevant is how many elements on the RHS you are trying to allocate to the LHS:

S = load('matlab_3Variable.mat');
size(S.price)
ans = 1x2
        5995           1
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
size(S.bubu)
ans = 1x2
        5995           1
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
index = S.i
index = 5995x1 logical array
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nnz(index)
ans = 5948

So you are trying to allocate 5995 elements on the RHS to 5948 elements on the LHS. That will not work.

Torsten 2024-6-6

编辑：Torsten 2024-6-6

在 MATLAB Online 中打开

matlab_3Variable.mat

load('matlab_3Variable.mat');
price(i)=bubu(i)
price = 5995x1
1.0e+03 *

    1.4645
    1.4645
    1.4645
    1.4645
    1.4645
    1.4645
    1.4645
    1.4645
    1.4645
    1.4538
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would set the values of price to the values of bubu for which i has logical 1 and leave the other values of price unchanged.

But if it's what you want - we don't know.

Luca Re 2024-6-6

ok txk

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Answer 1

Matlab Pro 2024-6-6

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https://ww2.mathworks.cn/matlabcentral/answers/2125966-left-and-right-sides-have-a-different-number-of-elements#answer_1468276

在 MATLAB Online 中打开

Hi @Luca Re

This is simple - since the 'i' is a logical indexing vector and is not all 'true'

length(find(i)) % == 5948
ans = 0

Thus: price(i) is a [5948x1] matrix and you want it to hold "bubu" which is 5995 matrix --> impossible

This - can be easliy fixed (if this is your requested outcome) like that;

price(i)=bubu(i);
Unrecognized function or variable 'bubu'.

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Luca Re 2024-6-6

hi, it's not correct because "price" and "bubu" can to have to different size

Stephen23 2024-6-6

编辑：Stephen23 2024-6-6

在 MATLAB Online 中打开

"it's not correct because "price" and "bubu" can to have to different size"

They do not need to be the same sizes:

A = rand(2,3)
A = 2x3
    0.3686    0.1659    0.7087
    0.4115    0.2469    0.8034
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B = rand(4,5)
B = 4x5
    0.3748    0.3379    0.6675    0.3304    0.4606
    0.1202    0.2557    0.4158    0.0023    0.7938
    0.1573    0.9340    0.4140    0.4896    0.3321
    0.8504    0.4113    0.6661    0.6588    0.1033
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X = [true,false,true,false,true]
X = 1x5 logical array
   1   0   1   0   1
A(X) = B(X)
A = 2x3
    0.3748    0.1573    0.3379
    0.4115    0.2469    0.8034
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What is relevant is how many elements on the RHS you are trying to allocate to the LHS.

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left and right sides have a different number of elements.

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left and right sides have a different number of elements.

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