Problem 2803. Split up vector or matrix delimited by NaNs

Created by Sky Sartorius

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<div style = "text-align: start; line-height: 20.4333px; min-height: 0px; white-space: normal; color: rgb(0, 0, 0); font-family: Menlo, Monaco, Consolas, monospace; font-style: normal; font-size: 14px; font-weight: 400; text-decoration: rgb(0, 0, 0); white-space: normal; "><div style="block-size: 93px; display: block; min-width: 0px; padding-block-start: 0px; padding-top: 0px; perspective-origin: 407px 46.5px; transform-origin: 407px 46.5px; vertical-align: baseline; "><div style="block-size: 42px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 21px; text-align: left; transform-origin: 384px 21px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; "><span style="block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 383px 8px; transform-origin: 383px 8px; unicode-bidi: normal; "><span style="">Given several vectors contained within one vector delimited by NaNs, return each individual vector as an element of a cell vector.</span></span></div><div style="block-size: 42px; font-family: Helvetica, Arial, sans-serif; line-height: 21px; margin-block-end: 9px; margin-block-start: 2px; margin-bottom: 9px; margin-inline-end: 10px; margin-inline-start: 4px; margin-left: 4px; margin-right: 10px; margin-top: 2px; perspective-origin: 384px 21px; text-align: left; transform-origin: 384px 21px; white-space: pre-wrap; margin-left: 4px; margin-top: 2px; margin-bottom: 9px; margin-right: 10px; "><span style="block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 210.5px 8px; transform-origin: 210.5px 8px; unicode-bidi: normal; "><span style="">Given several matrices combined in one matrix delimited by all-NaN</span></span><span style="block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 2px 8px; transform-origin: 2px 8px; unicode-bidi: normal; "><span style=""> </span></span><span style="block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 14.5px 8px; transform-origin: 14.5px 8px; unicode-bidi: normal; "><span style="font-style: italic; ">rows</span></span><span style="block-size: auto; display: inline; margin-block-end: 0px; margin-block-start: 0px; margin-bottom: 0px; margin-inline-end: 0px; margin-inline-start: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; perspective-origin: 138px 8px; transform-origin: 138px 8px; unicode-bidi: normal; "><span style=""> , return each matrix as an element of a cell vector.</span></span></div></div></div>

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Solution Stats

91 Solutions
4 Solvers

Last Solution submitted on Apr 28, 2021

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5 Comments

5 Comments

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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.

Dyuman Joshi 13 hours and 35 minutes ago

Test suite has been updated to include row vectors as test cases as well.

Solution Comments

Solution 559044

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4 Comments

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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 = [])"

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Problem 2803. Split up vector or matrix delimited by NaNs

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Problem 2803. Split up vector or matrix delimited by NaNs

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