Custom function,how to make custom function or graph in matlab

Question

Rehan 2015-4-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/209888-custom-function-how-to-make-custom-function-or-graph-in-matlab

编辑： Image Analyst 2015-4-18

Hello Sir, I have read many solutions of yours,which you given,you are nodoubt helping people,i also have a problem,i want to make a custom function,i am attaching picture,please have a look and tell me if i have x(i,j) values 0 to 10 and these values are on x-axis so how i can find values by puting this formula Xmd(x(i,j)). on x-axis L=11,so values on x-axis are o to 10 and on y axis values are from 0 to 1. thanks

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Answer 1

Image Analyst 2015-4-18

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/209888-custom-function-how-to-make-custom-function-or-graph-in-matlab#answer_175707

在 MATLAB Online 中打开

So just make a function

function signal = MakeSignal(a, b, L, yHeightAtB, numElements)
x = linspace(0, L-1, numElements);
y = ones(1, numElements); % Initialize
slope2 = .....
segment2 = x >= a & x <= b;
y(segment2) = equation of that line.....
segment3 = x >= b;
y(segment3) = equation of that line.....

That's a good start - go ahead and finish it.

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Rehan 2015-4-18

编辑：Image Analyst 2015-4-18

在 MATLAB Online 中打开

Thank you very much sir.you helped me a lot.here is the solution which i have done. 5 stars

clear all 
clc
a=100;
b=160;
L=256;
numElements=256;
x = linspace(0, L-1, numElements);
y = ones(1, numElements);
slope2 =-0.01;
for i = a:b    
    y(i)=(-0.01*i)+2;
end
for j=b:L-1
    y(j)=(-0.004*j)+1;
end