How to plot the exponentional function in matlab

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lakom Mariem 2017-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/362489-how-to-plot-the-exponentional-function-in-matlab

评论： lakom Mariem 2017-10-25

Hello everyone

I want to plot this expression of probability in matlab y=exp(-(K-1)) in function of P[dB]. How can I do it? Please i need help.

I tried with this code but it doesn't go.

function y = Swb(K,p)
  K=4;
  y= exp(-(K-1));
end

回答（2 个）

Image Analyst 2017-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/362489-how-to-plot-the-exponentional-function-in-matlab#answer_287016

You need to use the plot() function.

Where does he say he wants the PSD? If he did, then yes, he'd use pwelch(). But I see him saying "I want to plot this expression...." and for that you'd use plot(). Of course his expression is just a single number since y = exp(-(K-1)) = exp(-(4-1)) = exp(-3) = 0.04978706.

I think he needs to read this link

Birdman 2017-10-21

I think you miss this part :

...in function of P[dB].

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lakom Mariem 2017-10-23

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https://ww2.mathworks.cn/matlabcentral/answers/362489-how-to-plot-the-exponentional-function-in-matlab#answer_287205

Thanks all me,I want to reproduce this figure.For every single curve ,there is its own expression of probability.For example, for "SW" the expression of probability is Psw = exp(-(K-1)).Please can anyone help me how can i do it if you please and thanks in advance.

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Image Analyst 2017-10-25

If K is just a single number, like 4, then exp(-(K-1)) is just exp(-3), which is just 0.0497870683678639, not a whole curve. What would you have as the x coordinate?

lakom Mariem 2017-10-25