i need help with two Qustion for matlab

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MatLab

Required
Write a function matmean that will receive a matrix as an input argument, and will calculate and return the overall average of all numbers in the matrix.
• Use nested loops, not built-in functions, to calculate the average.
Sample Output
>> A = [1 2 3; 4 5 6]
A =
1 2 3
4 5 6

>> matmean(A)
ans =
3.5000

>> matmean([-1 3;0 5])
ans =
1.7500

>> matmean([1 2 3 2 1])
ans =
1.8000

>> matmean(5)
ans =
5

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Required
Write a program tempchart to display a temperature conversion chart.  The main script will:
•   Call a function that explains what the program will do.
•   Call a function to prompt the user for the minimum and maximum temperatures in degrees Fahrenheit and return both values.  This function checks to make sure that the minimum is less than the maximum.  If not, it calls a subfunction to swap the values.
•   Call a function to display temperatures in degrees F from the minimum to the maximum in one column, and the corresponding temperature in degrees Celsius in another column.  The conversion is C = (F - 32) * 5 / 9.
Sample Output
>> tempchart
This program displays a temperature conversion chart.
You need to enter a minimum and maximum temperature (in F).
The program will then display a table in both F and C.
Enter the minimum temperature value (degrees F): 32
Enter the maximum temperature value (degrees F): 40
   32.0 F        0.00 C
   33.0 F        0.56 C
   34.0 F        1.11 C
   35.0 F        1.67 C
   36.0 F        2.22 C
   37.0 F        2.78 C
   38.0 F        3.33 C
   39.0 F        3.89 C
   40.0 F        4.44 C
>> tempchart
This program displays a temperature conversion chart.
You need to enter a minimum and maximum temperature (in F).
The program will then display a table in both F and C.
Enter the minimum temperature value (degrees F): 32
Enter the maximum temperature value (degrees F): 25
   25.0 F       -3.89 C
   26.0 F       -3.33 C
   27.0 F       -2.78 C
   28.0 F       -2.22 C
   29.0 F       -1.67 C
   30.0 F       -1.11 C
   31.0 F       -0.56 C
   32.0 F        0.00 C
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