How can I insert numbers 1-100 into the first column of a cell array? (2024)

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Brooke Yeager on 14 May 2021

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Commented: Brooke Yeager on 14 May 2021

Accepted Answer: the cyclist

I know this sounds simple... maybe it's Friday and my brain is fried, so bare with me.

I have a cell array that is 100x8. I simply want the first column of this array to be numbers 1-100, such that the first row of the first column has a 1, the second row of the first column has a 2, the third row of the first column has a 3, and so on until the 100th row of the first column has 100. These numbers will correspond to the trial numbers.

I don't know why I can't figure this out.

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the cyclist on 14 May 2021

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Don't feel bad. Even after decades of use of MATLAB, I sometmes have to tinker around to remember the exact syntax for different operations using cell arrays. (Even with the solution I proposed, I feel in the back of my mind that there is a simpler way.)

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the cyclist on 14 May 2021

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Edited: the cyclist on 14 May 2021

Open in MATLAB Online

Here is one way:

N = 100;

% Set up an empty cell array

C = cell(N,8);

% Fill the first column

C(:,1) = num2cell(1:N)

C = 100×8 cell array

{[ 1]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 2]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 3]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 4]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 5]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 6]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 7]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 8]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[ 9]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[10]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[11]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[12]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[13]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[14]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[15]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {[16]} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double} {0×0 double}

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DGM on 14 May 2021

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There we go. I feel like I'm in the same boat as OP today.

the cyclist on 14 May 2021

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There is always more room in the "Here is one way but I think there is a better way" boat. I am regularly humbled here by the elegant solutions that are obvious (in retrospect).

Brooke Yeager on 14 May 2021

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This worked beautifully. Thank you for your help!!!

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DGM on 14 May 2021

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Open in MATLAB Online

Someone can surely improve on this, but this is one way

C = cell(10,4) % i'm just going to use a smaller example array

C(:,1) = mat2cell((1:10).',ones(10,1),1)

gives

C =

10×4 cell array

{[ 1]} {0×0 double} {0×0 double} {0×0 double}

{[ 2]} {0×0 double} {0×0 double} {0×0 double}

{[ 3]} {0×0 double} {0×0 double} {0×0 double}

{[ 4]} {0×0 double} {0×0 double} {0×0 double}

{[ 5]} {0×0 double} {0×0 double} {0×0 double}

{[ 6]} {0×0 double} {0×0 double} {0×0 double}

{[ 7]} {0×0 double} {0×0 double} {0×0 double}

{[ 8]} {0×0 double} {0×0 double} {0×0 double}

{[ 9]} {0×0 double} {0×0 double} {0×0 double}

{[10]} {0×0 double} {0×0 double} {0×0 double}

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Brooke Yeager on 14 May 2021

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Thank you for your suggestion!!!

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How can I insert numbers 1-100 into the first column of a cell array? (2024)

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