# Karan Gill

### MathWorks

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I write the Symbolic Math Toolbox documentation.

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substitute value for variable

You shouldn't overwrite |I1|. Overwriting |I1| will not automatically substitute for it in |Wo1|. Instead, remove |I1 = trace(B)...

6 years ago | 1

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Passing the numeric matrix to symbolic function

You're not passing any arguments to the function. To learn that, see <https://www.mathworks.com/help/matlab/ref/function.html?s_...

6 years ago | 0

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Solving a third order ODE in MATLAB

Do you not get this warning? If you got it, was the warning clear? Warning: Unable to find explicit solution. > In dsol...

6 years ago | 0

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The output is displayed as syntax error for the question ilaplace(4/sˆ3,s,t).Tried a lot but couldn't figure it out.Please help.

Your "ˆ" is wrong. Should be "^". Try ilaplace(4/s^3,s,t)

6 years ago | 2

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Absolute Newb: How Does Licensing Work?

You definitely need to contact support: <https://www.mathworks.com/support/contact_us/index.html?s_cid=ans2doc_man_link https://...

6 years ago | 1

Beginner: Can help with my code? it seems it does not work, and I always get an error.

It looks like |p| and |q| and maybe other inputs are text inputs. Symbolic functions need symbolic input. Use |str2sym|: <https:...

6 years ago | 0

How to use poly2list for specific variables?

In general, I don't recommend using MuPAD commands, as the note at the top says. Is |coeffs| helpful? >> syms x y p =...

6 years ago | 0

symbolic vector to usual vector.

You don't need a loop to sum |g|. Just use |sum|. Then use |vpasolve| instead of |solve| to get numeric results. Easy. |vpaso...

6 years ago | 0

How can I solve This system of ODEs?

You have numeric values in your equations, so solve this numerically. Try |ode45|: <https://www.mathworks.com/help/matlab/ref/...

6 years ago | 0

Error: Conversion to double from sym is not possible.

To plot symbolic expressions, use |fplot| instead of |plot|. See <https://www.mathworks.com/help/symbolic/fplot.html?s_cid=ans2d...

6 years ago | 0

Add more latex packages for latex interpreter in Matlab

Googling found If not then see <http://www.mathworks.com/matlabcentral/answers/52340-why-do-deep-paths-in-usepackage-cause-te...

6 years ago | 0

How do I solve an equation with multiple symbolic variables with a condition on one of the variables?

You should first solve the equation for |c| and then use that value to find |fs|. Also, your problem sounds like an optimizat...

6 years ago | 0

Hi Guys! Please can someone help me plot JUST THE REAL (not imaginary) part of this two differential equations, here is my code? Thank you.

Use the |real| function. fplot(real(I_1Sol)) Does this give the expected plot? Karan.

6 years ago | 0

fplot differentiated symbolic equation

You made a simple mistake. You used anonymous functions instead of symbolic functions. Declare a symbolic function using sy...

6 years ago | 0

Help with iterating to get one final value with for loop

Do not use |f1(i)|. Instead use subs: <https://www.mathworks.com/help/symbolic/subs.html?s_cid=ans2doc_man_link https://www.math...

6 years ago | 0

another way to compile my guide without using the matlab compiler?

I think you're looking for |matlabfunction| : <https://www.mathworks.com/help/symbolic/matlabfunction.html?s_cid=ans2doc_man_lin...

6 years ago | 0

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Error using plot ; spectrum of function

Plot symbolic functions by using |fplot|. fplot(h) See <https://www.mathworks.com/help/symbolic/fplot.html?s_cid=ans2doc...

6 years ago | 0

fplot keeps returning horizontal line

You are plotting a constant |Atom_Cf_P| with value |1.8235e-78|. A horizontal line is the expected output. What were you expecti...

6 years ago | 0

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how to calculate the maximum value of a function assigned to a 'sym'?

The |max| function does not find the maximum of a symbolic function. Please read the doc on |max|. Your question is a math qu...

6 years ago | 1

How to solve an ODE with a function symbolically?

You could start with the existing doc on solving ODEs symbolically: * <https://www.mathworks.com/help/symbolic/solve-a-single...

7 years ago | 0

I want to take an Equation as input like ax^2+bx+c =0 , Now I want to take the co-efficient. What will be the code?

You could try the <http://www.mathworks.com/help/symbolic/coeffs.html?s_cid=ans2doc_man_link coeffs> command. Note that coeffs a...

7 years ago | 0

Attribution de licence disponible et modification de type de licence

Vous trouverez sur ce site <http://fr.mathworks.com/company/aboutus/contact_us/?s_cid=ans2doc_man_link http://fr.mathworks.com/c...

7 years ago | 0

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how to combine symbolics and if statement?

Piecewise is available starting 16b: <http://www.mathworks.com/help/symbolic/piecewise.html?s_cid=ans2doc_man_link http://www.ma...

7 years ago | 2

How to use the Marcum-Q function as a symbolic function for vpaintegral.

Why do you need a variable-precision integration of this function starting frome "x"? The error is because the marcumq functi...

7 years ago | 1

Help with symbolic toolbox

You do not need to declare "ess". And you don't use "ratio". So your first line is syms P S Z "assume" is not the right ...

7 years ago | 1

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Problem with ordinary differental equation

I think what you're asking is how to go from symbolic to numeric form? Use the "subs" function to substitute symbolic values wit...

7 years ago | 0

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I want to solve this implicit derivative

Use "dsolve" : <https://www.mathworks.com/help/symbolic/dsolve.html?s_cid=ans2doc_man_link https://www.mathworks.com/help/symbol...

7 years ago | 0

Solve Difference Equations symbolically

Use dsolve: <https://www.mathworks.com/help/symbolic/dsolve.html?s_cid=ans2doc_man_link https://www.mathworks.com/help/symbolic/...

7 years ago | 0

MAtlab symbolic toolbox and removal of Mupad interface

Starting R2017a, units are available in MATLAB via Symbolic Math Toolbox. See: <https://www.mathworks.com/help/symbolic/units...

7 years ago | 0

how to use MATLAB units ?

Starting R2017a, units are available in MATLAB via Symbolic Math Toolbox. See: <https://www.mathworks.com/help/symbolic/units...

7 years ago | 1

| accepted