Tips and tricks: Difference between revisions

Tips and tricks (edit)

1,195 bytes removed , 21 September 2012

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 ==General==
-===A funny formatting trick with fprintf found by chance===
-Imagine that you want to create a text table with fprintf with 2 columns of 15 characters width and both right justified. How to do this thing?
-That's easy:
-If the variable Text is a cell array of strings (of length <15) with two columns and a certain number of rows, simply type for the kth row of Text
- fprintf('%15.15s | %15.15s\n', Text{k,1}, Text{k,2});
-The syntax '%<n>.<m>s' allocates '<n>' places to write chars and display the '<m>' first characters of the string to display.
-Example:
- octave:1> Text={'Hello','World'};
- octave:2> fprintf('%15.15s | %15.15s\n', Text{1,1}, Text{1,2})
-          Hello |           World
-===Load Comma Separated Values (*.csv) files===
- A=textread("file.csv", "%d", "delimiter", ",");
- B=textread("file.csv", "%s", "delimiter", ",");
- inds = isnan(A);
- B(!inds) = num2cell(A(!inds))
-This gets you a 1 column cell array. You can reshape it to the original size by using the <code>reshape</code> function
-The next version of octave (3.6) implements the <code>CollectOutput</code> switch as seen in example 8 here:                    http://www.mathworks.com/help/techdoc/ref/textscan.html
 ===Using Variable Strings in Octave Commands===