Visit Our UNIX and Linux User Community

Matlab help! Reading in a file with a variable filename

Thread Tools Search this Thread
Homework and Emergencies Homework & Coursework Questions Matlab help! Reading in a file with a variable filename
# 1  
Old 01-29-2011
Matlab help! Reading in a file with a variable filename

1. The problem statement, all variables and given/known data:
I want to read in a file, and plot the data in matlab. However, I do not like hardwiring filenames into my codes, so I always give the user the option to specify what the filename is. I am pretty inexperienced with matlab, so I have no idea how to do this!

2. Relevant commands, code, scripts, algorithms:

My algorithm is as such:

Ask for the user to specify the filename they want to open,
have the script open the specified file,
plot the data.

3. The attempts at a solution (include all code and scripts):


char file [20];
file = input('What is the filename you would like to read?');

fopen file;



file = input('~~~~')

fopen file;

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):

Iowa State University
Ames, IA usa
Ganesh Rajagopalan
AerE 261

---------- Post updated at 10:49 PM ---------- Previous update was at 09:50 PM ----------

Actually, I discovered a "uigetfile" command, so I got that down.

However, i'm having trouble assigning those values to variables.

I've tried the following:

[a, b, c] =


a = filename(:,1);

How do I assign the values in each column to a matrix of values?

Previous Thread | Next Thread
Test Your Knowledge in Computers #39
Difficulty: Easy
IC chips for computer systems are usually made of silicone.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Non trivial file splitting, saving with variable filename

Hello, Although I have found similar questions, I could not find advice that could help with our problem. The issue: We have a few thousands text files (books). Each book has many chapters. Each chapter is identified by a cite-key. We need to split each of those book files by... (4 Replies)
Discussion started by: samask
4 Replies

2. Shell Programming and Scripting

Output of matlab as a variable for shell script

I'm running a matlab code within a shell script. This is how I do it, matlab -nodesktop -nosplash -nojvm -r "my_program;quit" This works fine. My matlab code prints out a single number, say "ans = 10" for example. I want to assign this to a variable in the shell script. I tried doing this... (18 Replies)
Discussion started by: lost.identity
18 Replies

3. Shell Programming and Scripting

reading variable value from a file

Hello, I need to read a variable value from script. Below is the scenario I am reading a value from an external file say a.txt a.txt: Jan Feb Mar I need the corresponding value of the months in in numerics such as Jan -->1, Feb-->2 etc. I have this mapping in another file... (1 Reply)
Discussion started by: aixjadoo
1 Replies

4. UNIX for Dummies Questions & Answers

Reading a variable from file

Hi, I have a situation where I need to read a variable from another file. But the problem is that the variable in the other file is starting with $. E.g. file1: $var1=out . file1 echo "Print : $var1" It works fine if the file1 is having var1=out (note that it is... (6 Replies)
Discussion started by: shash
6 Replies

5. Shell Programming and Scripting

reading the whole line from a file into a variable

Hi, I am doing : while read line do printf "%s\n" ${line} done <datafile.txt but I am not getting each single line from the data file assigned to the variable line (but only tokens/fields at a time). I also tried while IFS= read -r lineI want the whole line assigned or read into the... (2 Replies)
Discussion started by: shri_nath
2 Replies

6. UNIX for Dummies Questions & Answers

assingn a variable a filename and then reading it in

Im trying to set a filename to a variable and then read the file in using the variable but im getting a syntax error. any ideas? #!/bin/bash function scanFile() { while read $1 do echo $filename done } file1=report.log scanFile() $file1 (3 Replies)
Discussion started by: magnia
3 Replies

7. Shell Programming and Scripting

Reading variable from file variable values

Hi, Here is the output of lpstat. I would like to read value of Queue which is(abxxxxb1)and status that is DOWN in first line. i dont care what is in second line. any one can help me.thanks Queue Dev Status Job Files User PP % Blks Cp Rnk ------- ----- ---------... (5 Replies)
Discussion started by: sagii
5 Replies

8. UNIX for Dummies Questions & Answers

get the latest file by reading the date in the filename.

Hi, I grep for a pattern in a list of files. "grep -i -l $pattern *.datx*" it may give me n number of files. say for eg, it gives me 2 files. lock_eicu_20071228_00000000.dat_20071228_05343100 lock_eicu_20080501_00000000.dat_20080501_05343900 out of these 2 files I need to get the... (7 Replies)
Discussion started by: prsshini
7 Replies

9. Shell Programming and Scripting

Piping to a file and setting filename using a variable

Hi all, I would like to send the output of a line in a ksh script to a file, but I need to name the file using a predefined variable: ls -l > $MYVAR.arc But what is the correct syntax for achieving this? I can't seem to find the correct syntax for giving the file an extension. Any... (8 Replies)
Discussion started by: mandriver
8 Replies

10. Shell Programming and Scripting

Reading a file using sh with spaces in filename

Hi I am trouble parsing through a file with spaces in the filename. I need to grab "supportIDPS/SCM/windows_install/file groups/dds.fgl" and then do a md5sum on it. I am using sh. Any help is appreciated. Here is an example of the input file: 7eedbc9f7902bf4c1878d9e571addf9a ... (4 Replies)
Discussion started by: jekl5
4 Replies
PLOT(5) 							File Formats Manual							   PLOT(5)

plot - graphics interface DESCRIPTION
Files of this format are produced by routines described in plot(3X) and plot(3F), and are interpreted for various devices by commands described in plot(1G). A graphics file is a stream of plotting instructions. Each instruction consists of an ASCII letter usually fol- lowed by bytes of binary information. The instructions are executed in order. A point is designated by four bytes representing the x and y values; each value is a signed integer. The last designated point in an l, m, n, a, or p instruction becomes the `current point' for the next instruction. The a and c instructions change the current point in a manner dependent upon the specific device. Each of the following descriptions begins with the name of the corresponding routine in plot(3X). m move: The next four bytes give a new current point. n cont: Draw a line from the current point to the point given by the next four bytes. p point: Plot the point given by the next four bytes. l line: Draw a line from the point given by the next four bytes to the point given by the following four bytes. t label: Place the following ASCII string so that its first character falls on the current point. The string is terminated by a newline. a arc: The first four bytes give the center, the next four give the starting point, and the last four give the end point of a circular arc. The least significant coordinate of the end point is used only to determine the quadrant. The arc is drawn counter-clockwise. c circle: The first four bytes give the center of the circle, the next two the radius. e erase: Start another frame of output. f linemod: Take the following string, up to a newline, as the style for drawing further lines. The styles are `dotted,' `solid,' `long- dashed,' `shortdashed,' and `dotdashed.' Effective only in plot 4014 and plot ver. s space: The next four bytes give the lower left corner of the plotting area; the following four give the upper right corner. The plot will be magnified or reduced to fit the device as closely as possible. Space settings that exactly fill the plotting area with unity scaling appear below for devices supported by the filters of plot(1G). The upper limit is just outside the plotting area. In every case the plotting area is taken to be square; points outside may be dis- playable on devices whose face isn't square. 4013 space(0, 0, 780, 780); 4014 space(0, 0, 3120, 3120); ver space(0, 0, 2048, 2048); 300, 300s space(0, 0, 4096, 4096); 450 space(0, 0, 4096, 4096); SEE ALSO
plot(1G), plot(3X), plot(3F), graph(1G) 7th Edition May 15, 1985 PLOT(5)

Featured Tech Videos