How to convert cell to matrix

I have a 100001x2 cell. Each cell is 1x1.

How can I convert it to matrix? I've tried cell2mat but I can't make it work

[Jon]

You don't provide enough detail for anyone to figure out how to help you with your problem. Please provide a self contained example, that reproduces the problem, and also let us know exactly what error messages you are getting

[Torsten]

We can't tell - usually it should work with cell2mat. Are you sure each cell contains a numeric value ? Can you share your code for testing ?

[Manuela Maria ALAMPI]

%Import data

data=uigetfile('*.dat','Select first baseline, second signal','MultiSelect', 'on');
signal=importdata(data{1,2});
signal=cell2mat(signal.textdata([6:end],[1,2]));

I've attached the file (the original one is .dat)

I can't find the error.

[Matt J]

The code you've shown does not produce a 100001x2 cell array. You should attach the cell array dirctly in a.mat file so that we can avoid the steps of generating it.

[Image Analyst]

ca = signal.textdata([6:end],[1,2]);
save('answers.mat', 'ca');

Then attach answers.mat with the paperclip icon.

Answer 1

[Jon]

Side stepping the issue a little bit, I can read in your data file perfectly as numerical values and not use cell2mat at all using:

A = readmatrix('i1uss.txt','NumHeaderLines',5)

[Jon]

The reason cell2mat doesn't work is that the variable

signal.textdata([6:end],[1,2])

is a cell array of quoted numerical values, e.g.

    {'-9.8e-07'  }    {'-0.0202357212'}
    {'-9.799e-07'}    {'-0.0202313547'}
    {'-9.798e-07'}    {'-0.0202269882'}

cell2mat doesn't know those are numbers and tries to make them into character arrays which don't have similar numbers of columns which gives a concatenation error.

You can just use:

    signal = str2double(signal.textdata([6:end],[1,2]))

which seems to work fine

[Manuela Maria ALAMPI]

It works! Thank you so much

[Matt J]

@Manuela Maria ALAMPI since it worked, you should Accept-click the post.

Answer 2

[Matt J]

cell2mat should have worked

A=num2cell(rand(100001,2)); whos A

  Name           Size               Bytes  Class    Attributes

  A         100001x2             22400224  cell               

B=cell2mat(A); whos B

  Name           Size              Bytes  Class     Attributes

  B         100001x2             1600016  double              

Answer 3

[Simon Chan]

Try this, where A is your 100001x2 cell:

cell2mat(cellfun(@(x) x,A))

[Manuela Maria ALAMPI]

It doesn't work