How do I change the format of symbolic output

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Peter van der Kamp 2024-5-28

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评论： Peter van der Kamp 2024-5-30

采纳的回答： Dyuman Joshi

When I type:

>> syms x y

>> solve(y-x^2,x)

I get:

ans =

[ 1/2 ]

[y ]

[ ]

[ 1/2]

[-y ]

How do I change the output format so to get MATLAB code (with * and ^), which by the way is what I used to get (before today)?

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VBBV 2024-5-28

在 MATLAB Online 中打开

@Peter van der Kamp use texlabel function

syms x y

sol = solve(y-x^2,x);

sol

sol =

solStr = texlabel(sol)

solStr = '[-{y}^{{1}/{2}}; {y}^{{1}/{2}}]'

Peter van der Kamp 2024-5-28

Thanks, it's nice to know that I can turn things into tex. But it's not what I want. I'd like to define the solutions as branches of a multivalued function which I can feed back into MATLAB. Of course, this is just a simple example which I created for the issue I'm having. I used to get my answer in the following format: e.g. sqrt(5/2 + sqrt(w^2 + 9/4)) which is what I'm after. I'm using version R2022b.

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Dyuman Joshi 2024-5-28

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Change the symbolic preference of Type-setting as follows -

syms x y

sol = solve(y-x^2,x)

sol =

%Preference changed (Default value is true)
sympref('TypesetOutput',false);
%Check the output now
sol
 
sol =
 
-y^(1/2)
 y^(1/2)
 

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Dyuman Joshi 2024-5-29

Based on your comments, things seem to be mixed up.

Yes, reinstalling MATLAB should clear the issue.

Let us know what happens after reinstalling.

Peter van der Kamp 2024-5-30

Hi Dyuman, good news here:

>> syms x y

>> solve(x-y^2,y)

ans =

-x^(1/2)

x^(1/2)

After reinstalling MATLAB and restarting my computer, things are working well again. IT suggested that maybe a restart of the computer could have fixed the problem (I tend to not do that often enough, sorry).

Cheers,

Peter

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Ninad 2024-5-28

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Hi Peter,

If you're using MATLAB version R2016b or newer, you can use "string(sol)" to convert the solution to a string format.

For versions older than R2016b, please use "char(sol)" to achieve the same outcome.

Below is a code snippet for your reference:

>> syms x y
>> sol = solve(y-x^2,x);
>> solStr = string(sol);
>> solChar = string(sol);
>> disp(solStr)
    "-y^(1/2)"
    "y^(1/2)"
>> disp(solChar)
    "-y^(1/2)"
    "y^(1/2)"