decimal to fraction conversion

I am given the number of women in an array in a new variable that equals 74. I am also given the total number of students in a new variable that equals to 144. I did the math on Matlab

fractionWoman =

(totalWoman./ totalStudents);

the answer is .513889. How do i make this into fraction? I have tried to rat function but it gives me multiple answers so i am confused.

[Nisar Ali]

1170/1351

>> format

>> x

x =

0.8660

and back to /

format rational

thank you

Answer 1

[Roger Stafford]

The 'rat' function returns with an output in the form of continued fractions. To see it as a single fraction, use "format rat".

Answer 2

[MHN]

format rational
74./ 144

or if you would like to have numbers

format rational
[num, dem] = rat(74./ 144);
num./dem

[Nisar Ali]

thank you sir

Answer 3

[Walter Roberson]

[num, dem] = rat(totalWoman./ totalStudents);

The fraction is then num / dem .

The output of rat is different when there are two outputs than when there is only one.

[Delany MacDonald]

It is now giving me two answers and they are not fractions

[Walter Roberson]

"The fraction is then num /dem". So

sprintf('%d/%d', num, dem)

[Sara Fawal]

Hello Walter I am trying to pass the NUM part of my fraction to create a changing vector name and in turn save this vector name at a .mat but I am having difficulty. Can you please help me :O)

My code is as follows:

for j=ETAC:0.05:1

    [num, dem] = rat(j);
    s1=num2str(num);
    s2='VEC';
    s3=strcat(s2,s1);
I want to pass the name of s3 to the line below
    s3{1:end}=[ETA,WD,W,THETAC,FS];
I want the .mat file to have the same name as the vector above.
    save('s3{1:end}.mat');
end

Please help. Thank you very much :O)

[Walter Roberson]

No, don't do that.

Would it be acceptable to have the mat file contain the variable with that name without first creating a workspace variable with that name?

[Sara Fawal]

I suppose that I can do that. More of a shortcut way of saving the variables I want into the .mat file. But how can I create a changing .mat file name in the save command.

Thank you again.

[Steven Lord]

Let's generate the numerator and denominator for a rational approximation to pi.

[num, den] = rat(pi);

We can build a filename using sprintf, num2str, or if you're using a sufficiently recent version of MATLAB string operations.

filename = sprintf('VEC%d_%d.mat', num, den)
filename2 = ['VEC' num2str(num) '_' num2str(den) '.mat']
filename3 = "VEC" + num + "_" + den + ".mat"

I'm going to add the name of the temporary directory tempdir to the start of the filename, so I don't write a file to your current directory.

thefullpath = fullfile(tempdir, filename)

Save a MAT-file there.

save(thefullpath, 'num')

Does it contain the variable num?

whos('-file', thefullpath)

[Walter Roberson]

Instead of going the route

(dynamic variable name somehow goes here) = value
save(thefullpath, dynamic variable name goes here)

to get the resulting variable name stored in the file designated by the variable thefullpath, you can instead use something like

fieldname = sprintf('VEC%d', num);
outstruct.(fieldname) = value;
save(thefullpath, '-struct', 'outstruct')

When the -struct keyword is used, instead of the struct itself being saved, the individual fields of the struct are saved as individual variables in the .mat .

Answer 4

[Kothandaraman Thanukodi]

format rat
1.5+4.25