left and right sides have a different number of elements.

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.

[Stephen23]

"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.

[Luca Re]

the problem is in the numbers equal to zero. How can I take only those greater than zero? if you use i>0 it becomes a logical variable for me but I want indices greater than zero ("price" and "bubu" can to have to different size)

[Stephen23]

https://www.mathworks.com/help/matlab/ref/nonzeros.html

[Luca Re]

yes...or i(i>0) ...is correct? or is better using noNZero

[Torsten]

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

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

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]

ok txk

Answer 1

[Matlab Pro]

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'.

[Luca Re]

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

[Stephen23]

"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.