MATLAB clc, clear x = -2*pi:pi/8:2*pi; y = sin(x); % replace 3 points with \"Not

Question

MATLAB

clc, clear

x = -2*pi:pi/8:2*pi;

y = sin(x);

% replace 3 points with "Not A Number (NaN)"

y(10) = NaN;

y(15) = NaN;

y(4) = NaN;

a.) Matlab has a function called isnan which can be used to clean up the y values above. Save the cleaned up y values in goodY. This will leave us with 3 extra x values. Use the isnan() function and the y (not goodY) values to remove the corresponding x values.

b.) Create a subplot for three graphs and plot the goodY and goodX on the top graph.

c.) Matlab has a built in function interp1 (one not L). Use this function to generate another set of y values like this
newY = interp1(goodX, goodY, x) ß notice the original x

d.) Now plot the newY as the 2nd graph

e.) Just for comparison plot the old y as the 3 graph using asterisk only so that you can see the missing points.

Explanation / Answer

clc, clear

x = -2*pi:pi/8:2*pi;

subplot(2,2,3)

plot(x,'*');

title('old x')

y = sin(x);

subplot(2,2,4)

plot(y,'*');

title('old y');

% replace 3 points with "Not A Number (NaN)"

y(10) = NaN;

y(15) = NaN;

y(4) = NaN;

goodY= isnan(y);

subplot(2,2,2)

plot(goodY);

title('goody')

goodX= isnan(x);

subplot(2,2,1)

plot(goodX,'*');

title('goodx')

figure,

newY = interp1(goodX,goodY,x);

plot(newY,'*');

title('newy')

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