Matlab function to take matrix as input and return elements in its four corners as output

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Amos Agbetile 2019-2-6

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评论： DGM 2024-6-6

Hello, good day all, please I'm having difficulties writing a function to take a matrix input, and return the elements in its cour corners as an output.

Here is my code:

function [top_left,top_right,bottom_left,bottom_right] = corners(i,r,c)
A = matrix(i,r,c)
top_left = A(1,1);
top_right = A(1,c);
bottom_left = A(r,1);
bottom_right = A(r,c);
function B = matrix(i,r,c)
ind = i;
row = r;
col = c;
B = randi(ind,row,col);

I keep getting Not enough input arguments.

Error in corners (line 2)

A = matrix(i,r,c)

I'll appreciate your response. Thanks.

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Matt J 2019-2-7

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编辑：Matt J 2019-2-7

在 MATLAB Online 中打开

Maybe this is what you really want:

function Acorners = corners(A)
  Acorners=A([1,end],[1,end]);
end

更多回答（5 个）

mayank ghugretkar 2019-6-3

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

here's the code to call:

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)

I think this will be much simpler approch..

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ilker melik 2020-5-2

it gives 4x5 matrix. each element of the matrix take values up to 100.

vaibhav jadhav 2020-6-7

its a simpler and easy way to do it

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Matt J 2019-2-6

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编辑：Matt J 2019-2-6

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I get no errors of any kind when I run your code, e.g.

[top_left,top_right,bottom_left,bottom_right] =corners(10,10,10)

gives

top_left =
     4
top_right =
     7
bottom_left =
     7
bottom_right =
     4

The only reason I can think of is you have a another function called matrix() higher in your path which is hiding the one you really want. Try,

>>which -all matrix

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Jos (10584) 2019-2-7

编辑：Jos (10584) 2019-2-7

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Strictly speaking, your function corners does not take a matrix input.

I think you asked to do something like this

function out = corners(M)
% M is the input matrix
out(1) = M(1,1)
% etc

Amos Agbetile 2019-2-7

在 MATLAB Online 中打开

yes, thanks. I think that's the problem. I'm supposed to use the function to run the following lines of code in the command window:

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

any suggestions please?

Thanks.

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TADA 2019-2-6

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编辑：TADA 2019-2-6

I Don't See Any Particular Problem With That Line.

The Problem Is Possibly That You Didn't Send Input Or Enough Input To corners When You Invoked It.

Try Calling Cornenrs From The Command Window With Valid Values, Or When You Run Using the Run Button T The Top Or Using F5, You Can Specify Input At The Run Button Menu

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harish kolla 2019-6-16

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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

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ilker melik 2020-5-3

编辑：ilker melik 2020-5-3

I get this idea of output argument and accesibility. But I defined also top_right, bottom_left and bottom_right as output argument. But why does particularly top_left pops out as an ans instead of other output arguments.

Stephen23 2020-6-7

"But I defined also top_right, bottom_left and bottom_right as output argument."

You defined them in the function, but you did not use any output arguments when calling the function.

How to call functions (with multiple output arguments) is explained in Steven Lords comment above and also in the introductory tutorials:

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

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nor el houda bouhaddoun 2020-5-19

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在 MATLAB Online 中打开

please can anybody help me because i don't know where the probleme is :

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

and it gives me this:

>> A = randi(100,4,5)

??? Undefined function or method 'randi' for input arguments of type 'double'.

and the m-file is in the current directory