loading file stored as string and then plotting data from file

I am attempting to create a script which asks the user for the filename of a txt file whose contents will later be plotted.

    filename = input('What is the filename (without the extension) e.g. RCP6: ','s');
    if isempty(filename)
    filename=input('What is the filename (without the extension) e.g. RCP6: ','s');
    end

    ext = input('What is the filetype (extension) e.g. .txt: ','s');
    if isempty(ext)
    ext=input('What is the filetype (extension) e.g. .txt: ','s');
    end

    filew = strcat(filename,ext)

    load(filew)
    A = filename
    Y = A(:,1)
    E = A(:,2)

    plot(Y,E)
    xlabel('calendar year')
    ylabel('annual fossil carbon emissions (GtC)')

As written, the code correctly concatenates filename and ext, however, it does not appear that load (filew) correctly loads that file, since given a filename = RCP3PD for example, Y = R and E = C, instead of Y storing the first column of values from RCP3PD.txt, and E storing the second column?

Any Suggestions? I have seen other "load file from string" threads make reference to the sprintf() function - would that apply here? Perhaps having the user point to a particular directory would be a better approach?

Answer 1

[per isakson]

I propose you replace

    load(filew)
    A = filename

by

    A = load( filew );

.

That makes the code easier to read and understand - I think.

Answer 2

[Sriram]

Yeah your code would give you as R and C....! If you are trying to access the content of the file you shd write as

Y = filew(:,1) % as you have loaded the file "filew"

What you have done would provide the first character of your filname ..And also check with the load command -- i hope it loads only the data files and not any other format...