I have created 800 Poisson distributed random numbers. then write those numbers in a .txt file. I want to write my each data value in new line like,
1
2
3
but it is coming like
1 2 3..
I used dlmwrite as,
dlmwrite('rts2_data.txt',rts2, '\t');
Which delimiter should I use to take each data value in new line?
I don't know specifically about Matlab, but \t is the tabulation character.
If you want a new line, perhaps you could use the new line character, \n, or maybe \r\n if it does allow more than one character (\r is a "carriage return").
Ok, so Matlab doesn't allow to place the new line character directly as delimiter. Instead, you can use this syntax:
dlmwrite('rts2_data.txt', rts2, 'delimiter', ' ', 'newline', 'pc');
As seen here. You can also check out this page which documents the parameters available for the dlmwrite function.
You can arrange the data as a column vector initially (not a row). dlmwrite tries to keep a matrix structure you have.
Here is my working example:
z=[0 1 2 3]
dlmwrite('rts2_data1.txt',z)
dlmwrite('rts2_data2.txt',z')
and the outputs of the files are:
rts2_data1.txt
0,1,2,3
rts2_data2.txt
0
1
2
3
Related
I read from text some comma seperated values.
-8.618643,41.141412
-8.639847,41.159826
...
I write script below;
get_in = zeros(lendata,2);
nums = str2num(line); % auto comma seperation.(two points)
for x=1:2
get_in(i,x)=nums(x);
end
it automatically round numbers. For example;
(first row convert to "-8.6186 , 41.1414")
How can i ignore round operation?
I want to get 6 digits after comma.
I tried "str2double" after split line with comma delimeter.
I tried import data tool
But it always rounded to 4 digits, too.
As one of the replies has already said, the values aren't actually rounded, just the displayed values (for ease of reading them). As suggested, if you just enter 'format long' into the command window that should help.
The following link might help with displaying individual values to certain decimal places though: https://uk.mathworks.com/matlabcentral/newsreader/view_thread/118222
It suggests using the sprintf function. For example sprintf(%4.6,data) would display the value of 'data' to 6 decimal places.
I am trying to write a quite large binary array to text file. My data's dimension is 1 X 35,000 and it is like :
0 0 0 1 0 0 0 .... 0 0 0 1
What I want to do is first add a string in the beginning of this array let's say ROW1 and then export this array to a text file with space delimiter.
What I have tried so far:
fww1 = strcat({'ROW_'},int2str(1));
fww2 = strtrim(cellstr(num2str((full(array(1,:)))'))');
new = [fww1 fww2];
dlmwrite('text1.txt', new,'delimiter',' ','-append', 'newline', 'pc');
As a result of this code I got:
R O W _ 1 0 0 0 0 1 ....
How can I get it as below:
ROW_1 0 0 0 0 1 ....
The most flexible way of writing to text files is using fprintf. There is a bit of a learning curve (you'll need to figure out the format specifiers, i.e. the %d etc.) but it's definitely worth it, and many other programming languages have some implementation of fprintf.
So for your problem, let's do the following. First, we'll open a file for writing.
fid = fopen('text1.txt', 'wt');
The 'wt' means that we'll open the file for writing in text mode. Next, let's write this string you wanted:
row_no = 1;
fprintf(fid, 'ROW_%d', row_no);
The %d is a special character that tells fprintf to replace it with a decimal representation of the given number. In this case it behaves a lot like int2str (maybe num2str is a better analogy, since it also works on non-integers).
Next, we'll write the row of data. Again, we'll use %d to specify that we want a decimal representation of the boolean array.
fprintf(fid, ' %d', array(row_no,:));
A couple thing to note. First, we the format specifier also includes a space in front of every number, so that takes care of the delimiter. Second, we only specified a single format but an array of numbers. When faced with this, fprintf will just go on repeating the format until it runs out of numbers.
Next, we'll write a newline to indicate the end of the row (\n is one of the special characters recognized by fprintf):
fprintf(fid, '\n');
If you have more lines to write, you can put a for loop over these fprintf statements. Finally, we'll close the file so that the operating system knows we're done writing to it.
fclose(fid);
So, I have a file that's designed to parse through a rather large csv file to weed out a handful of data points. Three of the values (out of 400,000+) within the file is listed below:
Vehicle_ID Frame_ID Tot_Frames Epoch_ms Local_X
2 29 1707 1163033200 8.695
2 30 1707 1163033300 7.957
2 31 1707 1163033400 7.335
What I'm trying to do here is to take previously filtered data points like this and plug it into another csv file using csvwrite. However, csvread will only take in the Epoch_ms in double precision, storing the value as 1.1630e+09, which is sufficient for reading, as it does maintain the original value of the number for use in MATLAB operations.
However, during csvwrite, that precision is lost, and each data point is written as 1.1630e9.
How do I get csvwrite to handle the number with greater precision?
Use dlmwrite with a precision argument, such as %i. The default delimiter is a comma, just like a CSV file.
dlmwrite(filename, data, 'precision', '%i')
I am trying to read a text file into matlab where the text file has been designed so that the columns are right-aligned so that my columns look like,
3 6 10.5
13 12 9.5
104 5 200000
This has given me two situations that I'm not sure how to handle in matlab, the first is the whitespace before the first data and the other is the variable number of whitespace characters in each row which seems to be beyond my knowledge of textscan. I'm tempted to use sed to reformat the text file but I'm sure this is trivial to someone. Is there a way that I can an arbitrary amount of whitespace as the delimeter (and have the line start with the delimeter)?
Use regexp on every line.
M = regexp(str, '\w+(\d+)','tokens')
Use the load command:
l = load('C:\myFile.txt')
It will work as long as you have only numbers, and same number of columns.
I want to read in a text file (using matlab) with data that is not in a convenient matlab matrix form. This is an example:
{926377200,926463600}
[(48, 13), (75, 147), (67, 13)]
{926463600,926550000}
[(67, 48)]
{926550000,926636400}
[]
{926636400,926722800}
[]
{926722800,926809200}
...
All I would like is a vector of all the numbers separated by commas. With them always being in pairs and the odd lines' numbers are of much greater magnitude each time, this can be differentiated by logic later.
I cannot figure out how to use textscan or the other methods. What makes this a bit tricky is that the matlab methods require a defined format for the strings separated by delimiters and here the even lines have non-restricted numbers of integer pairs.
You can do this with textscan. You just need to specify the {} etc as whitespace.
For example, if you put your sample data into the file tmp.txt (in the current directory) and run the following:
fid = fopen('tmp.txt','r');
if fid > 0
numbers = textscan(fid,'%f','whitespace','{,}[]() ');
fclose(fid);
numbers = numbers{:}
end
you should see
numbers =
926377200
926463600
48
13
75
147
67
13
926463600
926550000
67
48
926550000
926636400
926636400
926722800
926722800
926809200
Just iterate through each character. (use fscanf or fread or whatever). If the character is a number (use str2num) , store it as a number , if it is not a number, discard it and start storing a new number when you encounter the next number.