Read Data

I need to read a file .txt with this format...

 1945;  6937;N;000 1946;  6976;N;000 1947;  6987;N;000

how i can read these data i dont know a lot about the sintaxis, pls help and i want plot the year 1945 and the level 6937 Perform linear regression and plot the trend data.

and finally Calculate the slope of the trend.

[Walter Roberson]

Are those all on one line, or are those three separate lines in the file?

Do you only want to plot for 1945? And only for 6937? If so then what is the variable that you want to plot?

[per isakson]

Does it look like this in an editor? Does ";" stand for new_line in the in text file?

[David Lopez]

yes the file is 1 (one) line, i have to separate the data and remove N;000, i just need take the year and the level and plot

[David Lopez]

of course for a lot of years

1945 6937

1946 6976

1947 6987

...

2011 7133

[per isakson]

But what does the file look like? What happened to "N;000"?

Answer 1

[Walter Roberson]

Try

fid = fopen('YourFile.txt', 'rt');
C = textscan(fid, '%f;%f;%*c;%*f', 'CollectOutput', 1);
fclose(fid);
Y = C{1}(1:2:end);
L = C{1}(2:2:end);
plot(Y, L)

[David Lopez]

thank you so much

[Walter Roberson]

Hmmmm, maybe the CollectOutput would not be appropriate here, and instead

Y = C{1}; L = C{2};

Better test to be sure.

[David Lopez]

actually, i did this

[ax]=C{1};

ay=ax(:,1);

al=ax(:,2);