Problem 2803. Split up vector or matrix delimited by NaNs

Created by Sky Sartorius

Solve Later

Given several vectors contained within one vector delimited by NaNs, return each individual vector as an element of a cell vector.

Given several matrices combined in one matrix delimited by all-NaN rows , return each matrix as an element of a cell vector.

Solve

Solution Stats

Last solution submitted on Aug 30, 2019

Last 200 Solutions

Problem Comments

4 Comments

4 Comments

Show 1 older comment

goc3 on 30 Dec 2014

The problem suite doesn't function properly. The following statement is the culprit:
assert(isequal(c = split_nan_delimited(x), y_correct))
and can be changed to:
assert(isequal(split_nan_delimited(x), c_correct))
for all the test cases.

Guillaume on 30 Dec 2014

Furthermore, do not test for emptiness with isequal. Use isempty instead. There are many ways to generate empty cell arrays and matrices in Matlab, none of which are equal with isequal.

Sky Sartorius on 30 Dec 2014

Doh! Embarrassing copy paste error. I hope it's all fixed now.

Guillaume on 30 Dec 2014

Test 10 still test for emptiness with isequal.

Solution Comments

Solution 559044

4 Comments

4 Comments

Show 1 older comment

Jan Orwat on 17 Jan 2015

'ans' bug? It seems that the output is not assigned correctly to ans. Solutions 559047 ...48 ...50 work.
To be more specific, several expressions does't return anything when the output is not specified. for example: cellfun(@nnz,{}); does't change the value of ans while: ans=cellfun(@nnz,{}); does (and ans = {})

rifat on 17 Jan 2015

Is that a bug on 'ans' or 'cellfun'?

Jan Orwat on 17 Jan 2015

it occurs for both arrayfun and cellfun, seems to be problem with ans. Here is an old topic on answers: http://uk.mathworks.com/matlabcentral/answers/46972-is-this-a-possible-matlab-bug-further-strange-behavior

Jan Orwat on 17 Jan 2015

btw. I've written "does (and ans = {})", should be "does (and ans = [])"

Problem Recent Solvers12

Problem Tags

delimited nan

Problem 2803. Split up vector or matrix delimited by NaNs

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers12

Suggested Problems

More from this Author4

Problem Tags

Problem 2803. Split up vector or matrix delimited by NaNs

Solution Stats

Last 200 Solutions

Problem Comments

Solution Comments

Problem Recent Solvers12

Suggested Problems

More from this Author4

Problem Tags

Players