How to write variable to symbolic ?
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A = 10; B = 15; C = 18;
lcm_ABC = lcm(sym([A, B, C]));
lcm_ABC = double(lcm_ABC);
ABC_N = lcm_ABC/A + lcm_ABC/B + lcm_ABC/C;
ABC_N = 20;
lcm_ABC = 90;
%i want to write it(ABC_N/lcm_ABC) as (20/90) or if may possible to write using formula (2/9)
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Star Strider
2016-7-26
1 个投票
Use the rats or rat functions, or format rat to display it as rational fractions in the Command Window.
4 个评论
Triveni
2016-7-26
Star Strider
2016-7-26
Using both the rats and rat functions (with sprintf for rat):
ABC_N = 20;
lcm_ABC = 90;
rs = rats(ABC_N/lcm_ABC,6) % Using ‘rats’
[rtn,rtd] = rat(ABC_N/lcm_ABC); % Using ‘rat’
rt = sprintf('%2.0f/%2.0f', rtn*10, rtd*10) % Display In Desired Format
rs =
2/9
rt =
20/90
These only affect the way the value is displayed. MATLAB retains full internal precision, so the result of this division, ‘(ABC_N/lcm_ABC)’, ‘rs’ in my code, will be stored as a double-precision floating-point value. The ‘rtn’ and ‘rtd’ values are also stored as double-precision numbers.
Triveni
2016-7-26
Star Strider
2016-7-26
My pleasure.
I did not realise you were using the Symbolic Math Toolbox.
To use the Symbolic Math Toolbox, the best (perhaps the only) way is to use the sym function for each variable:
A = 10; B = 15; C = 18;
A = sym(A);
B = sym(B);
C = sym(C);
lcm_ABC = lcm([A, B, C]);
ABC_N = lcm_ABC/A + lcm_ABC/B + lcm_ABC/C;
All the results are then symbolic as well. This will produce the result you want.
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