Problem 830. Fill a zeros matrix

Created by Aurelien Queffurust

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The aim is to fill an array of all zeros given a numerical value and the index of row and columns for this value.3 Inputs:<ul><li>value : unique numerical value to fill the square zero matrix</li><li>row : index of row to fill</li><li>col : corresponding index of column to fill</li></ul>1 Output:- a matrix of same size which have for each row and col the value specified.Example 1Fill a 2*3 matrix with the value -13 for the line 2 and column 3 :<pre class="language-matlab">value = -13;
row = 2;
col = 3;
</pre>output B is:<pre class="language-matlab">B = [0 0 0
 0 0 -13]
</pre>Example 2<pre class="language-matlab">value = 2012;
row = [ 2 3 3 5 ];
col = [ 1 1 4 4 ];
</pre>output B is<pre> B =</pre><pre> 0 0 0 0
 2012 0 0 0
 2012 0 0 2012
 0 0 0 0
 0 0 0 2012</pre>RestrictionsSorry, as usual I want to make this problem a little bit harder:
The following commands are forbidden: zeros, for, repmat, ones, while, and sparse.

The aim is to fill an array of all zeros given a numerical value and the index of row and columns for this value.

3 Inputs:

* value : unique numerical value to fill the square zero matrix
* row : index of row to fill
* col : corresponding index of column to fill

1 Output:

- a matrix of same size which have for each row and col the value  specified.

*Example 1*

Fill a 2*3 matrix with the value -13 for the line 2 and column 3 :
  
  value = -13;
  row = 2;
  col = 3;
  
output B is:

B =  [0     0     0
        0     0   -13]

*Example 2*

value = 2012;
  row = [ 2 3 3 5 ];
  col = [ 1 1 4 4 ];

output B is

B  =
  
             0           0           0           0
          2012           0           0           0
          2012           0           0        2012
             0           0           0           0
             0           0           0        2012

*Restrictions*

Sorry, as usual I want to make this problem a little bit harder:
The following commands are forbidden: *zeros, for, repmat, ones, while, and sparse*.

Solve

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1959 Solutions
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Last Solution submitted on Sep 14, 2022

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9 Comments

Show 6 older comments

Jean-Marie Sainthillier on 19 Jul 2012

Useful in practice !

Andrew Newell on 24 Aug 2013

There is an error in the statement of the problem: the matrix is the smallest that is compatible with the indices, and is not necessarily square.

Marcel on 11 Jan 2014

how about including "regexp" in the forbidden commandlist?

bainhome on 23 Aug 2014

"regexp" should be forbidden in this problem...ps:the forbidden is so powerful that I can put "zeros" word inside my function's comment.:lol

Milan Petrovic on 18 Jan 2017

How about forbiding regexp?

Said BOUREZG on 2 Jun 2017

I like it

Li Ding on 20 Oct 2017

In the problem, line 3 "square matrix" should have the "square" removed; plural of index will be indices... Nevertheless I like the problem especially with all those forbidden words.

Jiahang Li on 24 Feb 2018

funny

Adrian Scott on 12 Dec 2020

How can you iterate without a FOR loop?

Solution Comments

Solution 3544285

1 Comment

1 Comment

Soobok on 4 Nov 2020

It was so hard to think the solution, there are any other solutions?
function B = your_fcn_name(value,row,col)
G = digraph(row,col);
B = full(adjacency(G));
B = B*value;
B=B(1:max(row),1:max(col));
end

Solution 3295423

2 Comments

2 Comments

Lesandu Wenitha Sugathadasa on 20 Oct 2020

Why this isn't working??

function B = name(value,row,col)
row=row';
col=col';
z=zeros(max(row),max(col));
[ro,~]=size(row);
for ii=1:ro
for jj=1
h=row(ii,jj);
b=col(ii,jj);
z(h,b)=value;
end
end
B=z;
end

Jacky QI on 30 Dec 2020

%considering the linear mapping of matrix index
function B = your_fcn_name(value,row,col)
B = 0*rand(row(end),col(end));
temp = row'+(col'-1)*row(end);
B(temp) = value;
end

Solution 2107800

1 Comment

1 Comment

Paresh yeole on 27 Jan 2020

Not sure if reshape is allowed. But desciption do not prohibits it.

Solution 1735058

1 Comment

1 Comment

Natasa on 24 Feb 2019

I am so proud of myself for solving this problem. :)) Nice challenge! :D

Solution 1619057

2 Comments

2 Comments

William Katzianer on 29 Aug 2018

Nice challenge. Learned how matrix indices are used

Fazle Rabbi Riyad on 18 Oct 2018

I have completed upto creating zero matrix but can't find anything specific to insert the values! any hints?

Solution 614640

1 Comment

1 Comment

Informaton on 28 May 2017

Overwrites assert.m

Solution 220703

2 Comments

2 Comments

Harish Maradana on 22 Mar 2013

function B = your_fcn_name(value,row,col)
B(row,col)=value;
end
but it shows error pls help me

Tim on 22 Mar 2013

When row and col are vectors of length n, B(row,col)=value resets all combinations of row(i) and col(j) (a total of n^2 elements); the problem wants just row(i) and col(i) (a total of n elements).

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Problem 830. Fill a zeros matrix

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Problem 830. Fill a zeros matrix

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