could anyone help me how to solve the error in the following code

I am having cell array

B=10x1 cell 

which contains

10x4 double
10x4 double
10x4 double
10x4 double
10x4 double
10x4 double
10x4 double
10x4 double
10x4 double
10x4 double

I used the following code to convert it

A=cell(size(B));
for i=1:numel(B)
    A{i}=splitapply(@(x){x}, 1:numel(B{i}) ,B{i});
    
    disp("YTest{" +i+ "}:"), B{i}
    for j=1:numel(A{i})
    disp("A{" +i+ "}{"+j+"}:"), A{i}{j}
    end
    disp ' '
end

But it results in error. Could anyone please help me to overcome it.

[jessupj]

what is the error, exactly?

what is the line

splitapply( @(x) {x}, 1:numel(B{i}) ,B{i} )

supposed to do? it looks like that's where is problem to me

[jaah navi]

Error using splitapply

Group numbers must be a vector of positive integers, and cannot be a sparse vector.

Error in line 3

A{i}=splitapply(@(x){x}, 1:numel(B{i}) ,B{i});

Answer 1

[Walter Roberson]

The last parameter to splitapply must be a vector of positive integers, one for each row of input, with the number indicating which group the row belongs to.

It is not clear that your B values are integers. It is clear that B{i} is not a vector.

Perhaps you accidentally exchanged the second and third parameters.

[jaah navi]

The code executes

A=cell(size(B));
for i=1:numel(B)
    A{i}=splitapply(@(x){x}, 1:numel(B{i}) ,B{i});
    
    disp("YTest{" +i+ "}:"), B{i}
    for j=1:numel(A{i})
    disp("A{" +i+ "}{"+j+"}:"), A{i}{j}
    end
    disp ' '
end

when B is

1x4 double

Now I want to modify the code as now B is

10x4 double

Could you please help me how to execute the code for

B=10x4 double.

[Walter Roberson]

That is not possible. The last parameter to splitapply must be a vector. Never a 2d array.

[jaah navi]

Ok. Is there any other way that can convert 10X 4 double into 10X4 cell.

[Walter Roberson]

num2cell()

[jaah navi]

if i use num2cell it executes, but the result is different from what i need.

[jaah navi]

I think i need to use splitapply but I am not aware how to use it in my case.

Could you please help me on this.

[Walter Roberson]

Unfortunately, you did not explain what output you want.

rng(12345)
B{1} = randi(9, 3, 4);
B{2} = randi(9, 3, 4);
celldisp(B)

 
B{1} =
 
     9     2     9     6
     3     6     6     7
     2     6     7     9

 
 
B{2} =
 
     1     6     9     7
     1     8     7     5
     3     8     6     3

 

What exact output would you want for the above?

[jaah navi]

I want B to convert to A.

B=3x1 cell

2x3 double - [1,1,1 - 1st row

1,2,2]- 2nd row

A=3x1 cell

2x1cell - [1,2,3] 1st row

2x2cell - [1] [2,3] 2nd row