take a value y of a function y = f(x) giving x.

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Francesco Pio
Francesco Pio 2023-6-3
回答： Star Strider 2023-6-3
Suppose we have the following code that creates the graph of the sine function:
x = 0:pi/100:2*pi;
y = sin(x);
plot(x,y)
Now I have the graph of the sine function. how can I get the value of the function by specifying the respective x-value? For example, how can I get the value of sin(51) based on the plot I created (it is not valid to use the matlab sine function)?

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回答（1 个）

Star Strider
Star Strider 2023-6-3
Ran in:
Use an appropriate interpolation function, such as interp1 or just index into it, depending on what you want to do —
x = 0:pi/100:2*pi;
y = sin(x);
y51 = y(51);
plot(x,y)
hold on
plot(x(51), y(51), 'ms')
hold off
axis('padded')
.

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