How can I calculate the avarage and how can I plot a Gaussian curve?

Question

friedl hulsmans 2017-12-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/370991-how-can-i-calculate-the-avarage-and-how-can-i-plot-a-gaussian-curve

评论： friedl hulsmans 2017-12-8

采纳的回答： Elizabeth Reese

scheurwijdte.m

N = 10;

axes('Nextplot' , 'add');

for i = 1 : N

% Betondekking c1 = 40 - 10; c2 = 40 + ((600/210) + (275/21)); c = c1 + rand * (c2 - c1);

% Betonkwaliteit fck = 26 + rand * (34-26);

% Breedte b1 = 300 - ((300/50)+7); b2 = 300 + ((300/50)+7); b = b1 + rand * (b2 - b1);

% Hoogte h1 = 600 - ((600/140)+(85/7)); h2 = 600 + ((600/140) + (85/7)); h = h1 + rand * (h2 - h1);

% Diameter beugels qb = 9.9775+rand *(10.0225-9.9775);

% Diameter trekwapening qs1 = 24.9775+ rand * (25.0225-24.9775);

% Aantal staven trekwapening ns1 = 2;

% Diameter drukwapening qs2 = 13.9775+ rand * (14.0225-13.9775);

% Aantal staven drukwapening ns2 = 2;

% Kruipfactor q1 = 0.8*1.5; q2 = 1.4 * 1.5; q = q1 + rand * (q2 - q1);

% Moment in GGT-Q med = 96 * (10^6)+ rand * (144 * (10^6) - 96 * (10^6));

% Elasticiteitsmodulus staal Es = 200000;

% Staalkwaliteit fyk = 500;

% Gemiddelde waarde van de drukstrekste van beton fcm = fck + 4 +rand * (12 - 4) ;

% Elasticiteitsmodulus beton Ecm = 22000*((fcm/10)^0.3);

Ec = Ecm / (1 + q);

% Alpha alpha = Es / Ec;

% Afstand getrokken rand tot zwaartepunt wapening As1 d1 = c + qb + (qs1/2);

% Afstand gedrukte rand tot zwaartepunt wapening As2 d2 = c + qb + (qs2/2);

% Nuttige hoogte d = h - d1;

% Trekwapening As1 = (pi * ns1 * (qs1^2))/4;

% Drukwapening As2 = (pi * ns2 * (qs2^2))/4;

% Totale wapening Astot = As1 + As2;

% Drukhoogte x = ((-alpha Astot)/b)+ sqrt(((alpha*Astot/b)^2)+((2*alpha(As1*d+As2*d2))/b));

% Scheurmoment fctm = 0.3 * (fck ^(2/3));

% Traagheidsmoment I = ((b*(x^3)/3))+ alpha * As1*((d-x)^2)+ alpha * As2*((x-d2)^2);

% sigmac = med*x /I;

% sigmas = alpha * sigmac * (d-x)/x;

h1 = (h-x)/3; h2 = 2.5*(h-d); h3 = h/2; H = [h1 h2 h3]; Aceff = b*min(H);

rhoeff = As1/Aceff;

Srmax1 = 3.4 * c + 0.17* qs1 / rhoeff; Srmax2 = 1.3 * (h - x); Srmax = min(Srmax1 , Srmax2);

epsilon1 = 0.6*sigmas/200000; epsilon2 = (sigmas / 200000)-(0.4*fctm*(1+alpha*rhoeff)/(rhoeff*200000)); epsilon = max(epsilon1,epsilon2);

wk = Srmax*epsilon

plot(wk,i,'.') end

xlabel('scheurwijdte')

I tried to plot a Gaussian curve a explain but is doesn't work. Can someone help me? I also want to calculate the avarage but it just gives me the last calculated number? Can someone help me with this? Or is can I make a histogram ? And How?

2 个评论
显示无隐藏无

Elizabeth Reese 2017-12-7

Please format your code or just attach the file so that we can run it. What variable is supposed to create a Gaussian curve? You can calculate the average of a vector using the mean function. https://www.mathworks.com/help/matlab/ref/mean.html

The histogram function can make a histogram of your data. You can reference this example to plot the probability density function over the histogram. https://www.mathworks.com/help/matlab/ref/histogram.html#buiynvy-14

friedl hulsmans 2017-12-8

I have attach the file. The variable wk is supposed to creat the Gaussian curve of the histogram

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Elizabeth Reese 2017-12-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/370991-how-can-i-calculate-the-avarage-and-how-can-i-plot-a-gaussian-curve#answer_295359

在 MATLAB Online 中打开

If you want to create a histogram of wk, then you want wk to be an array where element i is from the i th iteration of the loop. In your attached script, you have N = 1, so there would only be one element. It looks like you originally wanted this to be N = 10.

In order to save the results from each iteration, you can add a line before the loop to initialize wk to be an array of length N.

wk = zeros(1,N);

Then, inside the loop, you would change

wk = Srmax*epsilon;

to

wk(i) = Srmax*epsilon;

This would save the iteration's wk value into the array.

After the loop, you can plot and average the wk array. For the histogram, you can let MATLAB calculate the number of bins using

histogram(wk)

or specify the number using

histogram(wk,numberOfBins)

To calculate the average, use

avgWk = mean(wk);

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

friedl hulsmans 2017-12-8

image.png

Thank u. I get a histogram now. But how can I change the figure I have attached to just 1 histogram ? Without the black part and how can I change the number on the axes?

请先登录，再进行评论。

How can I calculate the avarage and how can I plot a Gaussian curve?

2 个评论
显示无隐藏无

采纳的回答

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

更多回答（0 个）

另请参阅

类别

标签

Community Treasure Hunt

How can I calculate the avarage and how can I plot a Gaussian curve?

2 个评论 显示 无隐藏 无

采纳的回答

1 个评论 显示 -1更早的评论隐藏 -1更早的评论

更多回答（0 个）

另请参阅

类别

标签

Community Treasure Hunt

2 个评论
显示无隐藏无

1 个评论
显示 -1更早的评论隐藏 -1更早的评论