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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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PLOT(5) 							File Formats Manual							   PLOT(5)

NAME
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)

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