Problem 135. Inner product of two vectors

Created by AMITAVA BISWAS

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10928 Solutions
2932 Solvers

Last Solution submitted on Sep 27, 2020

Last 200 Solutions

Problem Comments

9 Comments

9 Comments

Show 6 older comments

David Young on 3 Feb 2012

I think it would be helpful if you specified whether the vectors are row vectors, column vectors, or whether they can be an arbitrary mixture. The test suite only has row vectors, but this makes it rather trivial.

Kuifeng on 4 Apr 2012

If the x and y vectors could be row and column vectors, then bsxfun(@times, x, y) does a better job

Nicholas Howe on 13 Apr 2012

Test set should include some column vectors.

Rik on 15 Aug 2013

if you make the example-function "y = fcn(x,y)
z = x*y", please make sure matlab at least handles it; "z = fcn(x,y)
z = x*y" would be preferred =)

Jerivington on 30 May 2016

This function already exists, look up the dot function

Jihye Sofia Seo on 8 Feb 2017

In the given code snippet, make some changes to correct the function definition. (The first line)

drummer on 4 Apr 2020

Tricky on the variable to return... not sure if it was for teaching how-to-debug purposes.
funny, after all.

Monalisa Pal on 21 Jun 2020

Remember to edit the return variable (change it from y to z)

BunnY on 23 Jun 2020

LOOK FOR 'y' IN-LINE 1

CHANGE IT TO 'z'!!!!!!!!!!

Solution Comments

Solution 2708316

1 Comment

1 Comment

HIMANSHU CHOUHAN on 18 Jul 2020

tried differnt method,every time it showing 'Assertion failed.', my result is right every time. give me tips so i can solve this problem.

Solution 2603185

1 Comment

1 Comment

Chantelle Spiteri on 23 Jun 2020

A one-line code... Smart question :) had forgotten about this command.

Solution 2589232

1 Comment

1 Comment

Piero Cimule on 20 Jun 2020

y = dot(x,y)

Solution 2339888

1 Comment

1 Comment

elaine parshall on 22 May 2020

This example doesn't work, should be z = dot(x,y), or z = sum(x.*y)

Solution 2294068

1 Comment

1 Comment

Yuval Levental on 19 May 2020

Please correct this problem. The output is y when it should be z_correct.

Solution 2058836

1 Comment

1 Comment

Manvendra Singh Rajawat on 16 Dec 2019

is the problem is correct? do we take output y or z?

Solution 2034291

1 Comment

1 Comment

Raymond MacNeil on 25 Nov 2019

LOL @y set as the output. I was nearly convinced this problem was invalid.

Solution 1779863

1 Comment

1 Comment

George Iskander on 10 Apr 2019

change the output variable to be z

Solution 1742850

1 Comment

1 Comment

Maurel on 5 Mar 2019

I'm a bit confused. The code outputs the correct answers for the test suite, but it seems I do not pass while submitting.

Solution 1394752

1 Comment

1 Comment

Anil Sarode on 26 Dec 2017

answer is in terms of z but function give answer in terms of y again confused and give error for simple problem

Solution 1117184

1 Comment

1 Comment

Jess Stuart on 7 Feb 2017

Nice little bug in there.

Solution 1026373

1 Comment

1 Comment

David Verrelli on 3 Sep 2018

This user (mohamed elbesealy) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV

Solution 931481

1 Comment

1 Comment

Daniel on 4 Aug 2016

This is correct. What am I missing?

Solution 898602

1 Comment

1 Comment

Jerivington on 30 May 2016

eazy eazy

Solution 229745

3 Comments

3 Comments

Daniel Pereira on 16 Apr 2013

Why is this smaller than just x*y'?

Carlos Adrian Vargas Aguilera on 1 Jul 2013

NOt just that, his output is y instead of z!! jajaj...

Mineralter on 30 Sep 2013

That is the matrix attribute!

Solution 167116

1 Comment

1 Comment

Harish Maradana on 23 Nov 2012

i wrote solution like below
z = sum(x.*y);
it is working on my laptop but in cody show incorrect tell me why

Solution 25216

3 Comments

3 Comments

Bryce on 2 Feb 2012

Hmmm, description is a little confusing. Is length(x) always = length(y)? Are they nx1 or 1xn? Anyhow, I submitted several possible solutions (e.g. z = x'*y, z = sum(x.*y)) all of which failed the test suite ... but they work fine on my machine!

David Young on 3 Feb 2012

Note that the output variable in the pattern is y, not z.

Stephen on 1 Mar 2012

ha, yeah. thanks for commenting about that. I didn't see it either.

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Problem 135. Inner product of two vectors

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Problem 135. Inner product of two vectors

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