MATLAB: Reading the contents of a text file

MATLABread file

I have the following content in a text file

1 2 3.45 4

2 2 3.43 4

3 2 3.23 4

4 2 3.46 4

5 2 3.345 4

6 2 3.4567 4

I'm trying to read the input in the following manner

m =  6
n =  4
fileid = fopen(f,'r');
content = fscanf(fileid,'%f', [m n]);

This doesn't return the above data as m x n .

May I know what's the right way to read this data?

Best Answer

Since you have R2019b, use the readmatrix function. Another option is readtable if it has headers you want to preserve.

If it a simple file, load will likely also work.

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MATLAB: Faster Method for removing duplicates

 >> node_u = unique(node, 'rows', 'stable')
 node_u =
    0.1234    5.6789
    3.4567    9.8765
    4.5678    8.7654

should be more efficient. What was the purpose of this conversion to cell array?

MATLAB: How can i write the number of line

Thodoris - if you want to write the row (or line) that each point corresponds to, try using the text function. Something like

 figure;
 data = [300 3.345
         301 4.456
         303 5.789];
 xlim([min(data(:,1))-1,max(data(:,1))+1]);
 ylim([min(data(:,2))-1,max(data(:,2))+1]);
 sRows = num2str([1:size(data,1)]');
 text(data(:,1),data(:,2),sRows);

The xlim and ylim are just used for illustration purposes to ensure that we can see the area we are interested in (that given by data). We then create a vector of strings, one for each row number using

 sRows = num2str([1:size(data,1)]');

and then label each point in data with those strings using text.

Try the above and see what happens!

Best Answer

Related Solutions

MATLAB: Faster Method for removing duplicates

MATLAB: How can i write the number of line

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