Topics: User Defined Functions and MATLAB Conditionals A mathematician needs you

Question

Topics: User Defined Functions and MATLAB Conditionals

A mathematician needs you to write a MATLAB Function to verify the format of a three character floating point number input. A valid (3 character) floating point number has the following properties:

1. Consists of exactly three of the following characters: +, -, . (decimal point), and 0 through 9

2. The + or - character may only appear (once) as the first character

3. The . (decimal point) character must appear exactly once, as either the first, second, or third character

4. All other characters must be the 0 through 9 characters

Outline:

1. Create a MATLAB Function .m file

2. Establish its name (validate), input (a String), and output (the logical value true or false)

3. Write the necessary MATLAB commands to determine the correct result, using the given input

4. Return the result, by assigning the output variable

5. Make sure to test your function when it is done – You need to write a separate Script file

Notes(s):

You will need to use the

<var> = input(<prompt>, 's');

version of input to read in and assign <var> the non-evaluated string that the user types.

Your function must not display anything to the screen, nor get any user input.

Your function will simply return true or false based on the validity of its input.

Sample Run(s):

Please enter a valid (3 character) double literal : 1234

1245 is not a valid (3 character) double literal

Please enter a valid (3 character) double literal : 123

123 is not a valid (3 character) double literal

Please enter a valid (3 character) double literal : +45

+45 is not a valid (3 character) double literal

Please enter a valid (3 character) double literal : 4.5

4.5 is a valid (3 character) double literal

Please enter a valid (3 character) double literal : 45.

45. is a valid (3 character) double literal

Please enter a valid (3 character) double literal : .45

.45 is a valid (3 character) double literal

Please enter a valid (3 character) double literal : +.1

+.1 is a valid (3 character) double literal

Please enter a valid (3 character) double literal : -1.

-1. is a valid (3 character) double literal

Please make it simple, and write it as codes..

thank you

Explanation / Answer

main.m

prompt = "Please enter a valid (3 character) double literal ";
str = input(prompt,'s');
bool = check_float(str)

check_float.m

function output = check_float(str)
if size(str) != 3
output = false;
end
if numel(strfind(str,'.')) != 1
output = false;
end
if numel(strfind(str(2:end),'+')) > 0
output = false;
end
if numel(regexp(str,'(+|.|[0-9])(.|[0-9])(.|[0-9])')) == 0
output = false;
end
output = true;

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