Write a function called corners that takes a matrix as an input argument and returns four outputs: the elements at its four corners in this order: top_left, top_right, bottom_left and bottom_right. (Note that loops and if-statements are neither neces

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Can't find a solution to this problem im a noob, please help, example

>> [a, b, c, d] = corners([1 2; 3 4])

a =

1

b =

2

c =

3

d =

4

[Alex Mcaulley]

It is an easy problem. What have you tried?

[Debaditya Chakraborty]

not quite sure what im doing, can you guide me

[Guillaume]

As Alex pointed out, it's an easy problem. I'd go as far as saying that if you don't know how to do that, you haven't even bothered to learn matlab basics. It's trivial indexing and if you can't solve it on your own, you will really struggle with any matlab assignment.

I'd recommend starting with the tutorial. Also matlab OnRamp

[Debaditya Chakraborty]

If my code to call the function is

A = randi(100,4,5)
[top_left, top_right, bottom_left, bottom_right] = corners(A)
B = [1; 2]
[top_left, top_right, bottom_left, bottom_right] = corners(B)

% Will I get it running by this function?

function [top_left,top_right;bottom_left,bottom_right] = corners(x)
top_left= x(1,1)
top_right=x(1,2)
bottom_left=x(2,1)
bottom_right=x(2,2)
end

[Guillaume]

Will I get it running by this function?

The easiest and, by far, the fastest way to know is to try it for yourself rather than waiting for us to tell you.

The answer, however, is no, even not taking into account the syntax error in the function definition.

[madhan ravi]

No, verify it yourself.

[Debaditya Chakraborty]

% I finally got it thanks everyone for the constant critisism, your ego tinkering critism helped a lot
function [a,b,c,d]=corners(x)
a=x(1,1)
b=x(1,end)
c=x(end,1)
d=x(end,end)
end 

[Sejal Syed]

Does not works Tried and done this Jst end the statements with ; so that it doesn't prints a b c d

[Sushant Pal]

function [top_left, top_right, bottom_left, bottom_right] = corners(x)
[m,n] = size(x);
top_left = x(1,1);
top_right = x(1, n);
bottom_left = x(m,1);
bottom_right = x(m, n);
end

[Rajas Patil]

The function does not get run

[SATHISHKUMAR S]

Thank you very much sir. I learned.

[QueenX]

That's really nice. Thanks a lot!

Answer 1

[Muhammad Barkhaya]

function [a,b,c,d]=corners(x)
a=x(1,1)
b=x(1,end)
c=x(end,1)
d=x(end,end)
end 

[Mukundan Rajagopal]

Thanks!

[Luis Paternina Espitia]

Thanks!

[B Akash]

tnx u soo much ....<3

Answer 2

[Yihan Liu]

Well, this one could work.

function [a,b,c,d]=corners(A)
[m,n] = size(A);
a=A(1,1); % Top left
b=A(1,n); % Top right
c=A(m,1); % Bottom left
d=A(m,n); % Bottom right
end 

[Guillaume]

Despite Sejal Syed's comment, the function that Debaditya ended up with does work and is slightly simpler (since it uses the end keyword) instead of querying the size.

Answer 3

[ABHIJIT BISWAS]

function [a, b, c, d] = corners(x)
a = x(1,1); %top left
b = x(1,end); %top right
c = x(end,1); %bottom left
d = x(end,end); %bottom right

The bottom left and bottom right are the most important part.

Check the 3rd and 4th line of code properly.

Hope this helps!

[Mohamad Kinan OTHMAN]

function [a,b,c,d]=corners(x)
[m,n]=size(x);
a=x(1,1); %top_left
b=x(1,n); %top_right
c=x(m,1); %bottom_left
d=x(m,n); %bottom_right
end

I did like that but it doesn't work, why?

[Ahmed MARUF]

check if it is save it corners.m format

then save it

then give the value of A

Such as

A = randi(100,4,5)

I hope it will work

[Image Analyst]

@Mohamad Kinan OTHMAN, Abhijit's way works fine:

m = randi(100, 6, 4)
[a, b, c, d] = corners(m)

function [a, b, c, d] = corners(x)
a = x(1,1); %top left
b = x(1,end); %top right
c = x(end,1); %bottom left
d = x(end,end); %bottom right
end

This (your way) also works fine:

m = randi(100, 6, 4)
[a, b, c, d] = corners(m)

function [a,b,c,d]=corners(x)
[m,n]=size(x);
a=x(1,1); %top_left
b=x(1,n); %top_right
c=x(m,1); %bottom_left
d=x(m,n); %bottom_right
end

[Karan]

function [top_left,top_right,bottom_left,bottom_right] = corners(rows, columns)
e = rand(rows,columns);
top_left = e(1,1);
top_right = e(1,end);
bottom_left = e(end,1);
bottom_right = e(end,end);
end

[DGM]

That's not an answer to the question that was asked, and it's hard to imagine the question for which it would be a practical solution.

You're supposed to take a given 2D array and return its corner elements. Instead, your function takes two size arguments and returns the corner elements of a random array of that size. In effect, the input arguments to your function are meaningless. The outputs are four random numbers. The fact that they are corner elements is completely inconsequential but in the trivial case of vectors. They're just a set of random numbers.

I think it's fair to say that this question has been exhausted. It's bad enough that people paste the same code over and over as if it's a helpful revelation. It should stand to reason that there's little use for answers that don't acknowledge the task at hand.

Answer 4

[Sisay Girma]

function [top_left, top_right, bottom_left, bottom_right] = corners(A)
top_left=A(1,1);
top_right=A(1,end);
bottom_left=A(end,1);
bottom_right=A(end,end);
end

% Code to call your function

A = randi(100,2,2)
[top_left, top_right, bottom_left, bottom_right] = corners(A)

[Rik]

What exactly does this answer add to the other answers in this thread? What does it teach? You're more than welcome to start answering questions, but why post a solution to a homework question where equivalent answers already exist?

You might be interested in giving Cody a try if you want to post your own solution for solved questions.

[DGM]

Other than a change of variable name, how is this any different? If it's not demonstrating something different, then why does it exist?