MATLAB: Unexpected Matlab Expression

problem in codeunexpected expressionunexpected operator

I am new to coding and am unsure why my code does not work it says "Unexpected MATLAB expression" for the 3 in my code.

This is my code E(x)= [-1 1] 3 . * exp (1) . ^ ((-x)./4)

Any help is appreciated

Best Answer

Natalie, try this:

E= [-1 1] * 3 *( exp (1) .^ ((-x)/4))

E will be a matrix 1x2 that first element is positive value and second will be the negative value

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Use .*

x=0:10
y=exp(-x)+exp(-0.5*x).*(-0.5*cos(3*x)-3*sin(3*x))

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https://in.mathworks.com/help/symbolic/jacobian.html - the function has to have symbolic arguments as mentioned in the link above , where as what you created was a function handle (@(x)).

x = sym('x',[1 3]);
syms(x) % the reason I used this is even you can access the elements of the vector x as like x1 or x(1) unlike x = sym('x',[1,3]) where you can only access the elements as x(1) but not as x1! 
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jacobian(f,x)

if you type

>> which jacobian -all
/Applications/MATLAB_R2018b.app/toolbox/symbolic/symbolic/@sym/jacobian.m  % sym method
>>

It shows that jacobian() belongs to symbolic math toolbox.

Best Answer

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