Problem with solve function

Hi if I use the solve function it doesnt work, like on my colleagues computer.

Here an example:

>> syms x
>> d=solve(x*5+15,x)
 
d =
 
                                      -3
>> d=solve(x*5+15==0,x)
 
d =
 
                                       x        

somehow I get d=-3 when I let the ==0 out, but this makes no sense to me.

Even when I use the example from the help Page

syms x
eqn = sin(x) == 1;
solx = solve(eqn,x)

my result is solx=x

Has anyone an Idea, what I am doing wrong? Maybe some settings I need to change?

Thank you for your help

Answer 1

[madhan ravi]

Try clear all at the very beginning and run your code , you are overwriting the variable which leads to confusion. FYI I got the correct results using your code without any flaws.

[Dorian Jaggi]

I already tried that and restartet the programm and everything. Maybe I need to reinstall it and hope for the best. Because as I mentioned it, it works on my colleagues computers excactly as it should, but not on mine.

[madhan ravi]

It can also happen that you have custom made function solve ? if so rename it or delete it. It’s better you contact Mathworks Technical Support team by clicking the Contact Us button on the top right corner of this page.

[Dorian Jaggi]

Hi, I did not create a custom made fucntion. But I just reinstalled everything and now its working again.

[madhan ravi]

Glad it worked.