Is it a loop problem ?

Question

Netanel malihi 2020-7-21

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评论： Netanel malihi 2020-7-23

Hello, this program needs to count the number of colors every 15 minutes for 6 hours (0:24 iteration).at the end of each iteration a graph is shown with all the colors and, at the end of the loop one more graph shows the amount of each color and the max and min. the problem I encountered is that the program asks the dimension of the matrix each time and shows the max/min graphs after each one but, I would like the program to ask for the dimension only one time and to show the max/min and amount per time frame only at the end of the loop for all colors.

the script is in the .xlsx file.

helping solve the issue will be much appreciated, guys.

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waqas 2020-7-21

Goood idea would be to just paste the code as .m file so that it can be easily implemented. Right now it is not very clear.

Netanel malihi 2020-7-21

ok,i added one .

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Answer 1

waqas 2020-7-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/568572-is-it-a-loop-problem#answer_468987

在 MATLAB Online 中打开

project_modified.m

The program can be stopped by using input to

MatrixDimInput(iteration)
%Modification in the function would result
function [m,n]=MatrixDimInput(iter)
    errorFlag=0 %errorFlag=0 if there is no error in the input. errorFlag=1 if an error is found.
 
    while 1
        if errorFlag==0 && iter ==0 %if there is no error
            prompt='Enter the matrix dimensions m x n. \n m is between 4 to 10, n is between 7 to 12. \n Enter m (4 to 10): '
            prompt2='Enter n (7 to 12): '
            m=input(prompt)
            n=input(prompt2)
        end
        if (m>=4 && m<=10 && n>=7 && n<=12 && rem(m,1)==0 && rem(n,1)==0)
            errorFlag=0 %no errors found
            break
        else
            errorFlag=1 %Error is found
            error='The dimensions you entered are incorrect. \n Please make sure that m is between 4 to 10, and n is between 7 to 12. \n Enter m (4 to 10): '
            error2='Enter n (7 to 12): '
            m=input(error)
            n=input(error2)
        end
    end
end

Problem with this is that it will not have m and n in the next iterations: so better idea would be to take out m and n inputs out of the function and give them as inputs (Implementation in attached in the .m file). However, the value of m and n would remain the same for every iteration after the first values that you select.

if iteration == 0            
            prompt='Enter the matrix dimensions m x n. \n m is between 4 to 10, n is between 7 to 12. \n Enter m (4 to 10): '
            prompt2='Enter n (7 to 12): '
            m_initial=input(prompt)
            n_initial=input(prompt2)
end 
 [m,n]=MatrixDimInput(m_initial,n_initial)
            
function [m,n]=MatrixDimInput(m_in,n_in)
    errorFlag=0 %errorFlag=0 if there is no error in the input. errorFlag=1 if an error is found.
 
    while 1
        if (m_in>=4 && m_in<=10 && n_in>=7 && n_in<=12 && rem(m_in,1)==0 && rem(n_in,1)==0)
            errorFlag=0 %no errors found
            m = m_in;
            n = n_in;
            break
        else
            errorFlag=1 %Error is found
            error='The dimensions you entered are incorrect. \n Please make sure that m is between 4 to 10, and n is between 7 to 12. \n Enter m (4 to 10): '
            error2='Enter n (7 to 12): '
            m=input(error)
            n=input(error2)
        end
    end
end

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Netanel malihi 2020-7-22

Thank you now it works well, except for one thing. If I enter wrong dimensions the first time and afterward correct dimensions it keeps giving error message 'wrong dimensions please try again....'

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Answer 2

Netanel malihi 2020-7-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/568572-is-it-a-loop-problem#answer_469503

anyone know how to fix it ?

when I enter wrong dimensions the first time and afterward correct dimensions it keeps giving error message 'wrong dimensions please try again....'

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Netanel malihi 2020-7-22

correct, I would like to assign the dimensions only once, but when I gave the wrong dimensions the program asked to put the correct one I did and it gave the same error.

now, I changed the lines and it solved the first problem but, now after the first sample, the loop stops, and I am asked to put the dimensions again.

thanks for your help it's greatly appreciated.

Netanel malihi 2020-7-23