Clc, clear, close all.

x =-5:. 1:5；

y(x & gt； = 1) = 3.* x(x & gt； = 1).^2+ 1;

y(x & gt； - 1 & amp； & ampx & lt 1) = 0;

y(x & lt； =- 1)=-x(x & lt； =- 1).^3+2;

Drawing (x, y)

Extended data:

Matters needing attention

grammar

If expression

statement

end

describe

MATLAB calculates the expression, and if it produces a logical true or non-zero result, it executes one or more MATLAB command statements.

When there are nested ifs, each if must match a corresponding ending.

When using else if or else nesting in an if statement, the general format is as follows:

If expression 1

Statement 1

Elseif expression 2

Statement 2

other

Statement 3

end