How can I find the two intersection points of the x and y axis of two equations in Matlab?

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Laura
Laura 2023-10-29
回答： Walter Roberson 2023-10-29
I need to find the two intersection points of the x,y axis of x^2 and log(x+1), I have tried it with the solve command and it does not work.

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Walter Roberson
Walter Roberson 2023-10-29
Ran in:
Example with deliberately different equations. You can study the techniques and appy them to your own code.
syms x y
eqn1 = y == 5*x^3;
eqn2 = y == log(x^2-2*x-1);
yintercept1 = solve(subs(eqn1, y, 0), 'returnconditions', true)
yintercept1 = struct with fields:
x: [3×1 sym] parameters: [1×0 sym] conditions: [3×1 sym]
yintercept1.x
ans = 
yintercept1.conditions
ans = 
yintercept2 = solve(subs(eqn2, y, 0), 'returnconditions', true)
yintercept2 = struct with fields:
x: [2×1 sym] parameters: [1×0 sym] conditions: [2×1 sym]
yintercept2.x
ans = 
xintercept1 = solve(subs(eqn1, x, 0), 'returnconditions', true)
xintercept1 = struct with fields:
y: 0 parameters: [1×0 sym] conditions: symtrue
xintercept2 = solve(subs(eqn2, x, 0), 'returnconditions', true)
xintercept2 = struct with fields:
y: pi*1i parameters: [1×0 sym] conditions: symtrue

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