Af(x) = A for x >= 0 and Af(x) = 0 for x < 0; -f(x) = -1 for x >= 0 and -f(x) = 0 for x < 0
1 回答
1
我假设您没有使用符号变量 . 对于matlab中的2D绘图,您需要两个相等大小的矢量,每个轴一个,因此您需要创建一个x轴矢量和y轴矢量 . 在你的例子中f(x)= 1- | x | for | x | <1你可以这样做:
x = linspace(-5,5,500); %x-axis vector from -5 to 5 with 500 points
y = zeros(1,500); %y-axis vector initialized to 0, also 500 points like the x-axis vector
y(abs(x) < 1) = 1- abs(x(abs(x)<1)); %the points corresponding to |x|< 1 are set to |x|
figure() %new figure
plot(x,y) %plot
box off %removing box
grid on %adding grid
xlabel('x axis', 'FontSize', 15) %label of x axis
ylabel('y axis', 'FontSize', 15) %label of y axis
axis([x(1), x(end), -0.5, 1.5]) %axis limits
有了这个你得到这样的情节:
对于其他功能,您必须像这一样进行, Build x轴向量和y轴向量 .
UPDATE: 在另一个例子中: f(x) = A for x >= 0 and f(x) = 0 for x < 0 :
A = 3;
x = linspace(-5,5,500); %x-axis vector from -5 to 5 with 500 points
y = zeros(1,500); %y-axis vector initialized to 0, also 500 points like the x-axis vector
y(x >= 0) = A; %the points corresponding to x >= 0 are set to A
figure() %new figure
plot(x,y) %plot
box off %removing box
grid on %adding grid
xlabel('x axis', 'FontSize', 15) %label of x axis
ylabel('y axis', 'FontSize', 15) %label of y axis
axis([x(1), x(end), -0.5, 3.5]) %axis limits
1 回答
我假设您没有使用符号变量 . 对于matlab中的2D绘图,您需要两个相等大小的矢量,每个轴一个,因此您需要创建一个x轴矢量和y轴矢量 . 在你的例子中f(x)= 1- | x | for | x | <1你可以这样做:
有了这个你得到这样的情节:
对于其他功能,您必须像这一样进行, Build x轴向量和y轴向量 .
UPDATE: 在另一个例子中:
f(x) = A for x >= 0 and f(x) = 0 for x < 0
: