How to read a txt file in matlab?

I'm completely new to Matlab, so my question may sound dumb! I apologize. I'm trying to open a txt file in Matlab and produce a colormap with the data in the file. But it seems like Matlab doesn't read the file correctly. I attached the file for your reference. I used 'importdata' function. It should look like

but every time I import the data, it shows something like this:

Can anyone please help me? Thank you so much in advance

[Image Analyst]

Your attached data look nothing like either one of those. Just open it in Notepad to see. It looks like this:

81.4724
90.5792
12.6987
91.3376
63.2359
9.7540
27.8498
54.6882

[EcoBase]

Oops!! I'm so sorry, I attached a wrong one. Please check the new file attached. (The file is too large, so I pasted only a few rows from the original one). What I'm trying to do is the same as this approach - https://kr.mathworks.com/matlabcentral/answers/337686-how-to-create-an-image-from-txt-file

The file contains x, y coordinates of an image and relevant value for each pixel. Thank you.

[EcoBase]

I uploaded two original files and shared in links below: https://drive.google.com/open?id=1utfXBqnRgjv6AIl_dSor-amooxk3-QwQ

https://drive.google.com/open?id=12NGdhO6xZ1525IkjLUhIHEKjSxbgGy1o

I'd really appreciate it if you could check and help me with the problem! Thank you.

Answer 1

[KSSV]

data = importdata('data.txt') ;  
x = data(:,1) ; y = data(:,2) ; z = data(:,3) ;
plot3(x,y,z) ;    % with the present data 

% If you want a surf plot and data is full
% surf 
N = 100 ; 
xi = linspace(min(x),max(x),N) ;
yi = linspace(min(y),max(y),N) ;
[X,Y] = meshgrid(xi,yi) ;
F = scatteredInterpolant(x,y,z,'linear','none') ;
Z = reshape(F(X(:),Y(:)),N,N) ;
figure
pcolor(X,Y,Z)

[EcoBase]

Thank you for your answer! I really appreciate your time commitment for this dumb question :-) I tried, but I see the same problem again. When I imported the data, the data matrix is shown like, for example, (0.7560, 0.2600, 0.0011), but it should be something like this, (756, 260, 0.00115986). I don't know if I just have to ignore this! Also, I got an error with 'scatteredInterpolant'.

[KSSV]

What error? Attach your whole file...If size is big...attach in drive and paste link here.

[EcoBase]

It says 'scatteredInterpolant' isn't a valid extrapolation type. Here are links for the file in two different format (text and excel). Thank you so much.

https://drive.google.com/open?id=1utfXBqnRgjv6AIl_dSor-amooxk3-QwQ

https://drive.google.com/open?id=12NGdhO6xZ1525IkjLUhIHEKjSxbgGy1o

[EcoBase]

Could decimals in Z axis matter? When I tried with other files containing only integers, it seemed to be working okay. I could produce an image in the way I wanted.