Question

1. Write a MATLAB user-defined function that finds the largest element(s) of a matrix. Name the function [max_value, max_index] - LASTNAMES matrix max (x), where input argument x is a vector or matrix (not a scalar), and the outputs are the maximum value(s) and indexes of the maximum value(s) of the mput x. Do not use MATLAB functions max() or find(). Use loops and if branches to determine the maximum elements of matrix. Check for correct number and valid inputs and display proper error/warning messages. Your program must include the 1/help information, a header, and proper line comments. Submit your function to BeachBoard. (8 Points)

matlab

Answer 1

function [max_value,max_index]=LASTNAMES_matrix_max(x)
%[max_value,max_index]=LASTNAMES_matrix_max(x)
%This function returns the maximum value in a vector or matrix, and the
%index at which the value is
%INPUTS:
%x = A numerical vector/matrix
%OUTPUTS:
%max_value = maximum value in x
%max_index = index of max_value
if isscalar(x)
error('Input must be a matrix or vector!!')
elseif ~isnumeric(x)
error('Input must be a numeric matrix or vector!!!')
else
max_value=x(1,1);
max_index=[1,1];
for i=1:size(x,1)
for j=1:size(x,2)
if x(i,j)>max_value
max_value=x(i,j);
max_index=[i,j];
end
end
end
if size(x,1)==1
max_index=max_index(2);
elseif size(x,2)==1
max_index=max_index(1);
end
end

Command Window - O X Editor - C:\Users\Vaibhav\Documents\MATLAB2\LASTNAMES_matrix_max.m - 0 >> help LASTNAMES_matrix_max [max_value,max_index]=LASTNAMES_matrix_max(x) This function returns the maximum value in a vector or matrix, and the index at which the value is INPUTS: x = A numerical vector/matrix OUTPUTS: max value = maximum value in x max_index = index of max_value >> [max_value,max_index] =LASTNAMES_matrix_max (1) Error using LASTNAMES matrix max (line 11) Input must be a matrix or vector!! >> [max_value,max_index] =LASTNAMES_matrix_max ('a') Error using LASTNAMES_matrix max (line 11) Input must be a matrix or vector!! >> [max_value,max_index]=LASTNAMES_matrix_max('av') Error using LASTNAMES matrix max (line 13) Input must be a numeric matrix or vector!!! >> [max_value,max_index]=LASTNAMES_matrix_max ([1,2,3,4]) max value = IIIIIIIIIIIIIIIIIIIII EDITOR PUBLISH VIEW LASTNAMES_matrix_max. m x +. function [max_value,max_index]=LASTNAMES_matrix_max (x) [max_value,max_index]=LASTNAMES_matrix_max (x) *This function returns the maximum value in a vector or matrix, and the findex at which the value is SINPUTS: $x = A numerical vector/matrix SOUTPUTS: Smax value = maximum value in x &max_index = index of max_value if isscalar (x) error('Input must be a matrix or vector!!') elseif wisnumeric (x) error('Input must be a numeric matrix or vector!!!') else max_value=x (1,1); max_index=[1,1]; for i=1:size (x,1) for j=l:size (x, 2) if x(i, j)>max_value max_value=x (i,j); max_index=[i,j]; max_index = end >> [max_value,max_index)=LASTNAMES_matrix_max ([1,2;34,4]) max_value = end 34 max_index = 1 end if size (x,1)==1 max_index=max_index (2); elseif size (x,2)==1 max_index=max_index (1); end end