x = 0:0.5:2*pi; err1 = x/30; err2 = x/30; y1 = sin (x); y2 = cos (x);MATLAB: How to plot some plots with error bar in one figure
errorbarplot
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REad about stem.
y = rand(1,10) ; stem(y)xlabel('x')ylabel('y')
If you want to solve a system of equations symbolically or using symbolic variables, use the solve function instead of fsolve. The fsolve function requires that the output of the function you specify as the first input be double precision numbers, not symbolic expressions.
If you must use fsolve with symbolic variables inside the function, you must convert those symbolic expressions into numbers using double before returning the numbers (not the symbolic expressions) from the function.
As a very simple example, put all this code into a function example373677.m and run it:
function y = example373677y = fsolve(@mysubfun, 3); function z = mysubfun(q)x = sym('x');r = x.^3-2*x-5;z = double(subs(r, q));Of course, with solve this is easier.
syms xy = solve(x.^3-2*x-5)You may need to use vpa to approximate y numerically.
vpa(y)One of the solutions returned in y should match the result you received from running the function.
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