finding min max in matrix with loops and condintion only

hi, its me again, got an exam next week. I need to find the ma number and min number and then print them,this what I comefore please help me with sintaxx and right writing

n=randi(6);
a=randi(100,n,n);
b=a(1,1);
for i=1:n
   { 
    for j=1:n
    {
       if a(i,j)<=a(1,1);
           b=a(i,j);
       end
           }
           };
           fprintf('min num is x=%d/n',b);

Answer 1

[Jan]

You have an exam next week and still do not know how to write a for loop in Matlab and how to use the documentation to find out how to do this?

doc for

Matlab does not use curly braces for code branches. This was C. Simply omit them.

The rest of the code is almost working. You do not want to compare the elements with a(1,1), but with b in

if a(i,j) <= a(1,1)

[yuval ohayon]

well its pretty much there but it not working properly. first its seems there is overflow or confusion with conditions,next I need to print the I,j indexex of the max num and the min num.

clear
clc
n=randi(6);
a=randi(100,n,n);
i=1;
j=1;

for i=1:n
     for j=1:n
    if a(i,j)<a(1,1)
       min=a(i,j);
    end 
    if a(i,j)>a(1,1);
           max=a(i,j);
       end

       end
  end

[Jan]

@yuval: Please learn how to format code in the forum: Mark it with the mouse and press the "{} Code" button. Then it can be read much easier.

Please do not only post the statement "seems there is overflow or confusion", but share what you are observing: an error message or does the result differ from your expectations?

If you want to display the indices i,j of the minimum and maximum, simply use a variable (or 2) to store these values.

I told you already, that you do not need

if a(i,j) <= a(1,1)

but

if a(i,j) <= b   % (or in your new version "max")

Note that "max" is a builtin function, so prefer another name, e.g. "maxValue". Then initialize maxValue with -Inf, the lowest possible number.

If you ignore my suggestions, I feel free to ask: Do you want some help?

[yuval ohayon]

just got it,much thanks,can you send me your email for other obsticles in other programs

[Jan]

@yuval: Sorry, I do not like to communicate by email. The idea of the forum is to share solutions in public, such that the complete community can profit from the work.

As long as I had the email contact activated, I got several messages per day like:

• Answer my question - it's urgent [without a link to the question or any further details]
• I offer you 5$ if you solve my homework soon. The question is ...
• I have an hypo-oxy semi-convertible extra vertex simulator with the standard inflate of 380 ppk. Matlab calculates the wrong output. What is the problem?
• I need the calculations of the paper "xyz: Special topic, Kali et al., Numerical Science 2019, 213ff)" until next Monday. Solve this fast.

Therefore I decided to change my profile picture to somewhat more frightening and disable the email contact. Now I have more time for posting answers (and this useless comment).

Good luck for you exams!

[Tim Berk]

How often did you get the $5 offer?

I'm considering a career switch..

[Walter Roberson]

"How often did you get the $5 offer?"

For me, twice in 7 years. One of those two was after I had already done the work, and the person didn't even send the money... The other was $5 to do a homework assignment.

In my experience, as soon as I mention money, the person decides their task is not so urgent after all. I don't recall that I have ever gotten as far as mentioning how much I charge: people lose interest upon finding out that I do charge for writing custom programs or for private consultation.

[Jan]

The offer of payments in the funny magnitude of some US$ came about twice per month. Assisting naive students with cheating might be more lucrative if you are willing to blackmail and ask for more money after the exams.

This forum offers assistance for free and I'm sure you can get all homework question solved here, if the own effort is shown and specific questions are asked.

Some years ago a person offered 5$ per minute, seriously, for a work over some month. He was a hedge fond manager, expected a 25/8 support and needed a software to destroy companies such, that the most money can be squeezed out. Frightening. I thought about how I would look, if he buys the company I'm employed in and crush it. Career switches are overestimated.