Kindly explain this command
49 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
final_song = cellfun(@plus, alto, treb, 'Uniform', 0);
Kindly explain this command. Basically i want to add alto and treb and they are being added. what does uniform and 0 mean in this command
0 Kommentare
Akzeptierte Antwort
Grzegorz Knor
am 22 Sep. 2011
Option Uniform or UniformOutput set to 0 (or false) means, that output from function will be stored in cell array. It is necessary when function (in your case plus) returns non scalar values. If you set the UniformOutput value to 1 ( or true), your function must return scalar values and the output will be concatenated into an array.
Look at examples:
a = {rand(1),rand(2),rand(3),rand(4)}
b = {rand(1),rand(2),rand(3),rand(4)}
cellfun(@plus,a,b,'UniformOutput', false)
a = {rand(1),rand(1),rand(1),rand(1)}
b = {rand(1),rand(1),rand(1),rand(1)}
cellfun(@plus,a,b,'UniformOutput', false)
a = {rand(1),rand(1),rand(1),rand(1)}
b = {rand(1),rand(1),rand(1),rand(1)}
cellfun(@plus,a,b,'UniformOutput', true)
5 Kommentare
Grzegorz Knor
am 22 Sep. 2011
So you have the answer. The sum of two matrices (vectors) is a matrix (vector) and not a scalar.
Weitere Antworten (1)
Jan
am 22 Sep. 2011
Have you read "help cellfun" and "<http://www.mathworks.com/help/techdoc/ref/cellfun.html doc cellfun>" already?
There you find the information, that 'Uniform' is an abbreviation for 'UniformOutput' - sometimes neato users write 'Uni' only. And the description is:
a logical value indicating whether or not the output(s) of FUN can be
returned without encapsulation in a cell array
Actually the parameter should be of type LOGICAL, but MATLAB converts the 0 kindly to FALSE, as a 1 is converted to TRUE. Try this:
f = cellfun(@plus, {1}, {2}, 'Uniform', 0);
disp(f);
disp(class(f));
f = cellfun(@plus, {1}, {2}, 'Uniform', 1);
disp(f);
disp(class(f));
f = cellfun(@plus, {1}, {[2, 3]}, 'Uniform', 0);
disp(f);
disp(class(f));
% But this fails, because the output cannot be written to a vector,
% because the elements have different sizes:
f = cellfun(@plus, {1}, {[2, 3]}, 'Uniform', 1);
0 Kommentare
Siehe auch
Kategorien
Mehr zu Creating and Concatenating Matrices finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!