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Matlab help! Reading in a file with a variable filename

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Homework and Emergencies Homework & Coursework Questions Matlab help! Reading in a file with a variable filename
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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):

clear,clc;

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

fopen file;

and

clear,clc;

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] =

and

a = filename(:,1);

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

kst2

kst(1)								       kst2								    kst(1)

NAME

       kst -- plots scientific data

SYNOPSIS

       kst

       kst    [ -F DATASOURCE ] [ -f STARTFRAME ] [ -n NUMFRAMES ] [ -s FRAMESPERSAMPLE [ -a ] ] kstfile

       kst    datasource [ -f STARTFRAME ] [ -n NUMFRAMES ] [ -s  FRAMESPERSAMPLE [ -a ] ] [ -P PLOTNAME ] [ -A] [ -d ] [ -l ] [ -b ] [ -x FIELD ]
	      [ -e FIELD ] [ -r RATE ] [ -y FIELD ] [ -p FIELD ] [ -h FIELD ] [ -z FIELD ] [ --png filename ] [ --print filename [ --landscape |
	      --portrait ] [ --Letter | --A4 ] ]

DESCRIPTION

       kst is a graphical data plotting tool, which includes the ability to plot live data (contiuously update the plot as new data becomes avail-
       able).

       kst may be run entirely from within its GUI, in which case no command line arguments are needed.  kst has a powerful wizard for easily set-
       ting up new plots.

       In the second invocation, kst loads pre-saved plot specifications from the file kstfile and optionally may override some of the settings in
       that file.

       In the third invocation, kst displays plots of the data as directed in the default manner.  Additional datasources may be specified on  the
       command	line  with  options for that datasource following it.  Command line options generally apply to all subsequent options unless later
       overridden.

OPTIONS

       -A     plot all curves in separate plots

       -a     average frames (simple mean) when plotting with -s.

       --A4   use A4 sized paper for printing.	Requires --print.

       -b     plot as bargraphs.

       -d     use points when plotting curves.

       -e FIELD
	      use FIELD as the magnitude of error bars applied to the next plot.

       -F datasource
	      override the datasource indicated in the kstfile and instead use datasource.

       -f STARTFRAME
	      begin plotting at STARTFRAME frames into the data.  Set to -1 to start at NUMFRAMES from the end of the data.

       -h FIELD
	      plot FIELD as a histogram.

       -l     use lines when plotting curves.

       --landscape
	      use landscape orientation for printing.  Requires --print.  --Letter use US Letter sized paper for printing.  Requires --print.

       -n NUMFRAMES
	      plot at most NUMFRAMES frames of data.  Set to -1 to indicate all of the data.

       -P PLOTNAME
	      plot all plots in the plot named PLOTNAME.

       -p FIELD
	      plot FIELD as a power spectrum plot.

       --png filename
	      render to a portable network graphics (png) image with file name filename and quit.

       --portrait
	      use portrait orientation for printing.  Requires --print.

       --print filename
	      print the plot to file filename and quit.

       -s FRAMESPERSAMPLE
	      plot every FRAMESPERSAMPLE frames when plotting.

       -x FIELD
	      use FIELD as the X-axis vector.

       -y FIELD
	      plot FIELD as an XY plot.

       -z FIELD
	      plot FIELD as an image.

EXAMPLES

       Plot all data in column 2 from data.dat.
	      kst data.dat -y 2

       Same as above, except only read 20 lines, starting at line 10.
	      kst data.dat -f 10 -n 20 -y 2

       also read col 1. One plot per curve.
	      kst data.dat -f 10 -n 20 -y 1 -y 2

       Read col 1 from data2.dat and col 1 from data.dat
	      kst data.dat -f 10 -n 20 -y 2 data2.dat -y 1

       Same as above, except read 40 lines starting at 30 in data2.dat
	      kst data.dat -f 10 -n 20 -y 2 data2.dat -f 30 -n 40 -y 1

       Specify the X vector and error bars: Plot x = col 1 and Y = col 2 and error flags = col 3 from data.dat
	      kst data.dat -x 1 -e 3 -y 2

       Get the X vector from data1.dat, and the Y vector from data2.dat.
	      kst data1.dat -x 1 data2.dat -y 1

       Placement: Plot column 2 and column 3 in plot P1 and column 4 in plot P2
	      kst data.dat -P P1 -y 2 -y 3 -P P2 -y 4

BUGS

       Please report bugs to either the kst mailing list at kst@kde.org or to the kde bugzilla under the kst product at http://bugs.kde.org/.	If
       you can run kst, you can easily report bugs by selecting Bug Report Wizard from the Help menu.

AUTHOR

       Matthew Truch <matt@truch.net>

LICENSE

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or
       any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no	Back-Cover
       Texts.  A copy of the license is included in the `COPYING.DOC' file as part of the kst distribution.

Version 2.0.3							 22 February 2011							    kst(1)