Randi command for a matrix

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Bilal Khurshid
Bilal Khurshid 2019-9-19
评论： Walter Roberson 2019-9-20
i am using a random generator for a matrix.
However the randi command is not working for matrix C with following error (Error using randi First input must be a positive scalar integer value IMAX, or two integer values [IMIN IMAX] with IMIN less than or equal to IMAX.)
clear all
clc
A = (textread('data_mat_ta01_11x5.txt'))'
size(A)
B=A/9
C=floor(B)
D=randi(C)

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回答（1 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2019-9-19
编辑：KALYAN ACHARJYA 2019-9-19
Wrong here,you read a txt file as A and Divide it by 9>>B, Is there any sense??
% Read a text file, variable name A
A = (textread('data_mat_ta01_11x5.txt'))'
size(A) % No use, you have not assigned to any variable
B=A/9
and
floor rounds each element of B to the nearest integer less than.
Regarding randi matrix generation: See the following example
%...........[3,4] reperesent the size of the required matrix
>> randi(10,[3,4]);
%........^Max element value in the matrix
ans =
9 10 3 10
10 7 6 2
2 1 10 10
Rquested you to debug the code, line by line and modify it accordingly. If you are just a beginner on Matlab, I suggested you to go through this
Good Wishes!
  2 个评论
Bilal Khurshid
Bilal Khurshid 2019-9-20
Dear Kalyan
Thanks for your response.
I have to make a code for random selection of all matrix values from as assumed interval [1,A/9]
A = (textread('data_mat_ta01_11x5.txt'))' %Reads file data_mat_ta01_11x5.txt and takes values for matrix A with size 11x5
size(A) % Verifies size of matrix A, to confirm it is 11x5
B=A/9 % divides all values of matrix A by 9 to meet the interval condition A/9
C=floor(B) % Converts values of matrix B to integer value as after division some values are decimal
D=randi(C) % Command to randomly select all values of the matrix in the range [1-A/9], however it is not working, is randi command ok for this purpose? or i have to use the range command
Walter Roberson
Walter Roberson 2019-9-20
You cannot pass an 11 x 5 array as the first parameter to randi().
D = arrayfun( @(c) randi([1 c]), C);

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