Problem 44950. Calculate Inner Product

Created by Pooja Lalan

Solve Later

Given two input matrices, x and y, check if their inner dimensions match.

If they match, create an output variable z which contains the product of x and y
Otherwise, z should contain a custom string message

Example:

x = [1 2;3 4]
y = [5;6]

z = [17;39]

x = [1 2 3;4 5 6]
y = [2 5;3 6]

z = "Have you checked the inner dimensions?"

z = "The inner dimensions are 3 and 2. Matrix multiplication is not possible"

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NOTE - An example of combining numbers and strings together is shown below:

x = "The sum of " + 4 + " and " + 3 + " equals " + 7

x =

      "The sum of 4 and 3 equals 7"

Solve

Solution Stats

2444 Solutions
664 Solvers

Last Solution submitted on May 25, 2020

Last 200 Solutions

Problem Comments

3 Comments

3 Comments

Rohiit Priyadarshan Muralidharan on 30 Mar 2020

I solved this question with an if condition and the size of my solution was 39. I found the size of the leading solution to be 14. This is the leading solution: function ans = in_prod(x,y)
"no";
try
x*y;
end
How is this even correct? I tried to paste the same solution instead of mine and the assertion failed. z is not mentioned anywhere in this code. Can someone enlighten me?

Pooja Lalan on 30 Mar 2020

If the output x*y is not assigned to any variable, MATLAB assigns it to the variable ans by default. In this solution, z has been replaced with ans in the function definition to return the unassigned output.

Hugo Ormo on 5 Apr 2020

I am confused... this ought to work:
function z = in_prod(x,y)
if size(x,2) == size(y,1)
z = x * y
else
z = "The inner dimensions are " + size(x) + " and " + size(y) + ". Matrix multiplication is not possible"
end

Solution Comments

Solution 2231713

1 Comment

1 Comment

Saad on 24 Apr 2020

Please, this code is working on Matlab but it did not work here , I think no problem with it
if size(x,2)==size(y,1)
z=x*y;
else
z = ['The inner dimensions are ', num2str(size(x,2)) ,' and ' ,num2str(size(y,1)), ' Matrix multiplication is not possible'];
end
display(z)

Solution 2231675

1 Comment

1 Comment

Saad on 24 Apr 2020

Please, this code is working on Matlab command widows, but in this problems it appears not correct, what is the problem please?

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Problem Tags

logic matrix manipulation

Problem 44950. Calculate Inner Product

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Last 200 Solutions

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Problem Recent Solvers664

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Problem 44950. Calculate Inner Product

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Last 200 Solutions

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Problem Recent Solvers664

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