MATLAB: Error: In an assignment A(:) = B, the number of elements in A and B must be the same.

errorMATLAB

Problem: TrajSimilarity is a struct of k elements, I want to put all the value of TrajSimilarity(1,k).aLongestString in a vector/array A. I try using this code but it generate error, can you help me to solve the problem?

Code:

for k=1:14
    A(k)=TrajSimilarity(1,k).aLongestString;
    end

Error:

In an assignment  A(:) = B, the number of elements in A and B must
be the same

Best Answer

I assume that A is either not initialized, or it is initialized as a numeric array. An element of a numeric array can only store one numeric value.

You might be able to use a cell array, which can store values of mixed types. In that case your syntax might be

A = cell(14,1);
for k=1:14
    A{k}=TrajSimilarity(1,k).aLongestString;
end

Notice the use of {} instead of () to access the contents of each cell.

Related Solutions

MATLAB: Cell contents reference from a non-cell array object.

Each cell of v contains a numeric vector. So your indexing here:

v{1}{k+1} = v{1}{k+1}-1
%   ^   ^       ^   ^ wrong type of bracekts for numeric array.

uses the wrtong type of brackets for indexing (curly braces are used to access the elements of a container array, e.g. the elements of a cell array, table, or string). The correct brackets for accessing the elements of a numeric array are parentheses, as shown here:

vchave = [2,2,2,2,2,2];
for k = 1:5;
    v{k} = vchave
    v{1,k} = v{1,k}-1
    v{1}(k+1) = v{1}(k+1)-1
end
v = 1x1 cell array
    {1×6 double}
v = 1x1 cell array
    {1×6 double}
v = 1x1 cell array
    {1×6 double}
v = 1x2 cell array
    {1×6 double}    {1×6 double}
v = 1x2 cell array
    {1×6 double}    {1×6 double}
v = 1x2 cell array
    {1×6 double}    {1×6 double}
v = 1x3 cell array
    {1×6 double}    {1×6 double}    {1×6 double}
v = 1x3 cell array
    {1×6 double}    {1×6 double}    {1×6 double}
v = 1x3 cell array
    {1×6 double}    {1×6 double}    {1×6 double}
v = 1x4 cell array
    {1×6 double}    {1×6 double}    {1×6 double}    {1×6 double}
v = 1x4 cell array
    {1×6 double}    {1×6 double}    {1×6 double}    {1×6 double}
v = 1x4 cell array
    {1×6 double}    {1×6 double}    {1×6 double}    {1×6 double}
v = 1x5 cell array
    {1×6 double}    {1×6 double}    {1×6 double}    {1×6 double}    {1×6 double}
v = 1x5 cell array
    {1×6 double}    {1×6 double}    {1×6 double}    {1×6 double}    {1×6 double}
v = 1x5 cell array
    {1×6 double}    {1×6 double}    {1×6 double}    {1×6 double}    {1×6 double}

I strongly recommend preallocating v before the loop.

MATLAB: In an assignment A(:) = B, the number of elements in A and B must be the same

Are the contents of the cells of A strings? Or even strings with multiple numbers in them? If so, you might have to use str2double() or sscanf().

Please see the FAQ on cell arrays: http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

Then attach S1223.dat after reading this link

Best Answer

Related Solutions

MATLAB: Cell contents reference from a non-cell array object.

MATLAB: In an assignment A(:) = B, the number of elements in A and B must be the same

Related Question