Hello everyone, I am using array of structures to read a text file that contains many lines of variable lengths. I am getting an error when MATLAB reads the longest line. The error is Error using fgets Invalid file identifier. Use fopen to generate a valid file identifier.

Aug 28, 2009 >Invalid file identifier. Use fopen to generate a valid file identifier. >>Error in ==>mydisplayGrid at 20 >line = fgetl(file)% lese erste Zeile der Datei. Call FOPEN with two output arguments and check to make sure the first is not -1; if it is, look at the second to determine why FOPEN was not able to open the file. What is maximum size of line. Error using fgets Invalid file identifier. Can anyone tell me is there any maximum limit of fgetl/fgets(as inside the fgetl MATLAB.

Error in fgetl (line 33) [tline,lt] = fgets(fid); Error in ReadRefGPSData (line 18) ASCII(i).tline= fgetl(fid); Where i in ASCII(i).tline= fgetl(fid); is the index or line number of the longest line. Can anyone tell me is there any maximum limit of fgetl/fgets(as inside the fgetl MATLAB function fgets is used)? If yes, what is the otherway around, to read a long line in two halves. I cannot break line in two or more shorter lines, as it is generated by system. Thanks in advance. Thank you for the comments.

Thank you for the answer. Yes, I tried but in vain. My tests indicate that in R2016a on OS-X, fgetl() can read lines whose lengths exceed 6/10 gigabytes. I expect that it would be able to handle lines up to the point where it runs out of memory or hits the limit you have configured on array size.

However, beyond about 1/4 gigabytes it gets pretty slow; I have had it working on reading 1.2 gigabytes for several minutes now, and the time it is taking leaves me wondering whether the internals are growing the array dynamically with lots of copying (rather than, for example, scanning ahead to determine how far away the line terminator is, allocating that much memory, and then going back to read in the line -- an algorithm you can only use on block structured inputs that you can seek backwards in.). Okay, so I have checked, and besides the obvious limit of 'amount of memory available', there is a more subtle limit.

Fgetl() is implemented by calling fgets(), similar to [data, line_terminator] = fgets(FileID); On my system, that worked fine on a line of total length, producing a data variable with twice that many bytes (because each char at the MATLAB level is 2 bytes.) Then fgetl does the equivalent of data = data(1:end-length(line_terminator)) and that was hitting the limit I had configured in preferences for maximum array size. I was puzzled as to why it was complaining about needing a 9 Gb array to do the above operation, when the output should be no more than *2 bytes, about 2 1/4 Gb. I was thinking that perhaps it was failing to take into account that char are smaller than double and was over-counting the space requirement. But then I realized that the 9 Gb was being required to generate the elements in the input vector, 1:end-length(line_terminator) which are being generated as double So that is the more subtle limit: your lines are limited to the number of characters equal to 1/8th of your configured largest array.

Lost Knowledge Of The Ancients Pdf. However, you will not get an error about invalid file ID if you encounter this: you will get an error about array being too large.

Hello all, I am trying to edit a base txt file by trying to locate a particular string and then replacin gthe text inder that heading (match1 match2 etc). Even though my file identifier is positive fwrite command is creating a problem. I am not quite sure as to how to proceed from here. Please find below my code and feel free to give suggestions. Cd ('filelocation') format long g z=1; current=dlmread('current.txt') [Length Width]=size(current)% open file for reading fidr= fopen('Base. Basketball Wheel Offense Pdf. yml','r'); for k = 1:Width-1% open file for writing filename=['Base_',num2str(k),'.yml']; fidw= fopen(filename,'w') for i = 1:Length fidw= fopen(filename,'w')% RUN until the end of file while(~feof(fidr))% get file identifier for next line str=fgets(fidr);% match the string in the bracket match = regexp(str,'- Name: Current1','match');% match the string in the bracket match1= regexp(str,'CurrentDepth, CurrentFactor, CurrentRotation:'.