CODEWITHSUNDEEP
matlabgraphmatlab-figurefigure
Tina
Tina

Reputation: 111

How to draw a stair-step graph using MATLAB for given value?

I want to draw a step graph using MATLAB.

In the X-axis, the value starts from 0 and increases like:
0, 0+20=20, 0+20+50=70, 0+20+50+80=150, 0+20+50+80+50=200...
and corresponding Y-axis values are: Y = [0.76 1.10 1.28 1.35 1.35 1.45 1.50]

I mean, when:
X value is 0-20, Y value is 0.76
X value is 20-70, Y value is 1.10
X value is 70-150, Y value is 1.28,
X value is 150-200, Y value is 1.35,...

Please, help me to draw the step graph. My sample code is given below which showed an error due to the different size of X and Y.

X = [0 20 50 80 50 50 50 100];
Y = [0.76 1.10 1.28 1.35 1.35 1.45 1.50];

for i=1:length(X)
    if i==1
       X(i)=0
    else
       X(i) = X(i-1) + X(i)
    end  
end
figure
stairs(X, Y, 'LineWidth',2)
xlim([0 500])
grid

Upvotes: 3

Views: 850

Answers (1)

Sardar Usama
Sardar Usama

Reputation: 19689

The end value of Y needs to be repeated.

stairs(X, [Y Y(end)], 'LineWidth', 2);

Other than that, your loop is replaceable with the built-in function cumsum.

X = cumsum(X);

Upvotes: 2

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