I want to load a text file whit ASCII characters and put all the content into a varialbe in MATLAB, This is the code i tried :
f =fopen('tp.txt')
The result I get is 1, then it increments each time I excute this code line.
However, when I try :
f =load('tp.txt')
I get this error :
??? Error using ==> load
Number of columns on line 1 of ASCII file D:\Cours\TP\tp.txt
must be the same as previous lines.
Error in ==> TPTI at 3
f =load('tp.txt')
My goal is to count the occurance of each charachter then calculate the propabilites and the entropies.
Any idea?
Try this:
%// Import file contents as a string
str = importdata('tp.txt'); %// each line is a cell
str = [str{:}]; %// concat all lines into a single string
%// Remove spaces. Maybe you want to remove other characters as well: punctuation...
str = regexprep(str, '\s', '');
%// Count frequency of each character:
freq = histc(double(str), 0:255); %// convert characters to ASCII codes and count
Related
I am trying to concatenate three lines (I want to leave the lines as is; 3 rows) from Shakespeare.txt file that shows:
To be,
or not to be:
that is the question.
My code right now is
fid = fopen('Shakespeare.txt')
while ~feof(fid)
a = fgets(fid);
b = fgets(fid);
c = fgets(fid);
end
fprintf('%s', strcat(a, b, c))
I'm supposed to use strcat and again, I want concatenated and leave them as three rows.
One method of keeping the rows separate is by storing the lines of the text file in a string array. Here a 1 by 3 string array is used. It may also be a good idea to use fgetl() which grabs each line of the text file at a time. Concantenating the outputs of fgetl() as strings may also be another option to ensure the they do not get stored as character (char) arrays. Also using the \n indicates to line break when printing the strings within the array String_Array.
fid = fopen('Shakespeare.txt');
while ~feof(fid)
String_Array(1) = string(fgetl(fid));
String_Array(2) = string(fgetl(fid));
String_Array(3) = string(fgetl(fid));
end
fprintf('%s\n', String_Array);
Ran using MATLAB R2019b
When I save a table as PDF (using report generator) I do not get the numeric fields (Index1, Index2, Index3) shortG format (total of 5 digits). What is the problem and how can I fix it?
The code:
function ButtonPushed(app, event)
import mlreportgen.dom.*;
import mlreportgen.report.*
format shortG;
ID = [1;2;3;4;5];
Name = {'San';'John';'Lee';'Boo';'Jay'};
Index1 = [71.1252;69.2343245;64.345345;67.345322;64.235235];
Index2 = [176.23423;163.123423654;131.45364572;133.5789435;119.63575647];
Index3 = [176.234;16.123423654;31.45364572;33.5789435;11.6647];
mt = table(ID,Name,Index1,Index2,Index3);
d = Document('myPDF','pdf');
d.OutputPath = ['E:/','temp'];
append(d,'Table 1: ');
append(d,mt);
close(d);
rptview(d.OutputPath);
end
To fix it, format your numeric arrays to character arrays with 5 significant digits before writing to PDF.
mt = table(ID,Name,f(Index1),f(Index2),f(Index3));
where,
function FivDigsStr = f(x)
%formatting to character array with 5 significant digits and then splitting.
%at each tab. categorical is needed to remove ' 's that appear around char
%in the output PDF file with newer MATLAB versions
%e.g. with R2018a, there are no ' ' in the output file but ' ' appears with R2020a
FivDigsStr = categorical(split(sprintf('%0.5G\t',x)));
%Removing the last (<undefined>) value (which is included due to \t)
FivDigsStr = FivDigsStr(1:end-1);
end
The above change gives the following result:
Edit:
To bring back the headers:
mt.Properties.VariableNames(3:end) = {'Index1', 'Index2', 'Index3'};
or in a more general way to extract the variable names instead of hardcoding them, you can use inputnames to extract the variable names.
V = #(x) inputname(1);
mt.Properties.VariableNames(3:end) = {V(Index1), V(Index2), V(Index3)};
which gives:
I am generating 2500 values in Matlab in format (time,heart_rate, resp_rate) by using below code
numberOfSeconds = 2500;
time = 1:numberOfSeconds;
newTime = transpose(time);
number0 = size(newTime, 1)
% generating heart rates
heart_rate = 50 +(70-50) * rand (numberOfSeconds,1);
intHeartRate = int64(heart_rate);
number1 = size(intHeartRate, 1)
% hist(heart_rate)
% generating resp rates
resp_rate = 50 +(70-50) * rand (numberOfSeconds,1);
intRespRate = int64(resp_rate);
number2 = size(intRespRate, 1)
% hist(heart_rate)
% joining time and sensor data
joinedStream = strcat(num2str(newTime),{','},num2str(intHeartRate),{','},num2str(intRespRate))
dlmwrite('/Users/amar/Desktop/geenrated/rate.txt', joinedStream,'delimiter','');
The data shown in the console is alright, but when I save this data to a .txt file, it contains extra spaces in beginning. Hence I am not able to parse the .txt file to generate input stream. Please help
Replace the last two lines of your code with the following. No need to use strcat if you want a CSV output file.
dlmwrite('/Users/amar/Desktop/geenrated/rate.txt', [newTime intHeartRate intRespRate]);
πβπ π πππ’π‘πππ π π’ππππ π‘ππ ππ¦ ππΎπ ππ π‘βπ π ππππππ π‘ πππ π¦ππ’π πππ π. πβππ πππ π€ππ ππ₯ππππππ π€βπ¦ π¦ππ’ πππ‘ π‘βπ π’πππ₯ππππ‘ππ ππ’π‘ππ’π‘.
The data written in the file is exactly what is shown in the console.
>> joinedStream(1) %The exact output will differ since 'rand' is used
ans =
cell
' 1,60,63'
num2str basically converts a matrix into a character array. Hence number of characters in its each row must be same. So for each column of the original matrix, the row with the maximum number of characters is set as a standard for all the rows with less characters and the deficiency is filled by spaces. Columns are separated by 2 spaces. Take a look at the following smaller example to understand:
>> num2str([44, 42314; 4, 1212421])
ans =
2Γ11 char array
'44 42314'
' 4 1212421'
I have a text file which has the contents as follows.. I need to read this file column wise (ies, 2 columns here). I have tried many ways.. but cannot do as it contains "(" , "," , ")" etc... please guide..
(-2.714141687294326, 0.17700122506478025)
(-2.8889905690592976, 0.1449494260855578)
(-2.74534285564141, 0.3182989792519164)
(-2.728716536554531, -0.3267545129349194)
(-2.280859632844493, -0.7413304490629143)
(-2.8205377507406095, 0.08946138452856946)
(-2.6261449731466335, -0.16338495969832847)
(-2.8863827317805537, 0.5783117541867042)
(-2.6727557978209546, 0.11377424587411682)
(-2.5069470906518565, -0.6450688986485736)
(-2.6127552309087236, -0.01472993916137419)
(-2.7861092661880185, 0.23511200020171835)
(-3.2238037438656533, 0.5113945870063824)
(-2.6447503899420304, -1.1787646364375748)
Try this:
x = importdata('filename.txt');
x = regexp(x,'-?\d+\.?\d*','match'); %// detect numbers as [-]a[.][bcd]
x = cellfun(#str2num, vertcat(x{:}));
If the file can contain numbers in decimal form ("1.234") and in scientific notation ("1.234e-56"):
x = importdata('filename.txt');
x = regexp(x,'-?\d+\.?\d*(e-?\d+)?','match');
x = cellfun(#str2num, vertcat(x{:}));
You can use fscanf and specify the desired format:
fid = fopen('filename.txt');
x = fscanf(fid,'(%f, %f)\n',[2,inf]).';
fclose(fid);
The format spec '(%f, %f)\n' reads to float values inside brackets, separated by , per line. With [2,inf] you specify to put it into a 2 x n array, where n is as large as needed. To have the same format as before, you'll have to transpose it again .'.
AIR, ID
AIR.SIT
50 1 1 1 0 0 2 1
43.57 -116.24 1. 857.7
Hi, All,
I have a text file like above. Now in Matlab, I want to create 5000 text files, changing the number "2" (the specific number in the 3rd row) from 1 to 5000 in each file, while keeping other contents the same. In every loop, the changed number is the same with the loop number. And the output in every loop is saved into a new text file, with the name like AIR_LoopNumber.SIT.
I've spent some time writing on that. But it is kind of difficult for a newby. Here is what I have:
% - Read source file.
fid = fopen ('Air.SIT');
n = 1;
textline={};
while (~feof(fid))
textline(n,1)={fgetl(fid)};
end
FileName=Air;
% - Replace characters when relevant.
for i = 1 : 5000
filename = sprintf('%s_%d.SIT','filename',i);
end
Anybody can help on finishing the program?
Thanks,
James
If your file is so short you do not have to read it line by line. Just read the full thing in one variable, modify only the necessary part of it before each write, then write the full variable back in one go.
%% // read the full file as a long sequence of 'char'
fid = fopen ('Air.SIT');
fulltext = fread(fid,Inf,'char') ;
fclose(fid) ;
%% // add a few blank placeholder (3 exactly) to hold the 4 digits when we'll be counting 5000
fulltext = [fulltext(1:49) ; 32 ; 32 ; 32 ; fulltext(50:end) ] ;
idx2replace = 50:53 ; %// save the index of the characters which will be modified each loop
%% // Go for it
baseFileName = 'AIR_%d.SIT' ;
for iFile = 1:1000:5000
%// build filename
filename = sprintf(baseFileName,iFile);
%// modify the string to write
fulltext(idx2replace) = num2str(iFile,'%04d').' ; %//'
%// write the file
fidw = fopen( filename , 'w' ) ;
fwrite(fidw,fulltext) ;
fclose(fidw) ;
end
This example works with the text in your example, you may have to adjust slightly the indices of the characters to replace if your real case is different.
Also I set a step of 1000 for the loop to let you try and see if it works without writing 1000's of file. When you are satisfied with the result, remove the 1000 step in the for loop.
Edit:
The format specifier %04d I gave in the first solution insure the output will take 4 characters, and it will pad any smaller number with zero (ex: 23 => 0023). It is sometimes desirable to keep the length constant, and in your particular example it made things easier because the output string would be exactly the same length for all the files.
However it is not mandatory at all, if you do not want the loop number to be padded with zero, you can use the simple format %d. This will only use the required number of digits.
The side effect is that the output string will be of different length for different loop number, so we cannot use one string for all the iterations, we have to recreate a string at each iteration. So the simple modifications are as follow. Keep the first paragraph of the solution above as is, and replace the last 2 paragraphs with the following:
%% // prepare the block of text before and after the character to change
textBefore = fulltext(1:49) ;
textAfter = fulltext(51:end) ;
%% // Go for it
baseFileName = 'AIR_%d.SIT' ;
for iFile = 1:500:5000
%// build filename
filename = sprintf(baseFileName,iFile);
%// rebuild the string to write
fulltext = [textBefore ; num2str(iFile,'%d').' ; textAfter ]; %//'
%// write the file
fidw = fopen( filename , 'w' ) ;
fwrite(fidw,fulltext) ;
fclose(fidw) ;
end
Note:
The constant length of character for a number may not be important in the file, but it can be very useful for your file names to be named AIR_0001 ... AIR_0023 ... AIR_849 ... AIR_4357 etc ... because in a list they will appear properly ordered in any explorer windows.
If you want your files named with constant length numbers, the just use:
baseFileName = 'AIR_%04d.SIT' ;
instead of the current line.