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48 lines
1.3 KiB
Plaintext
48 lines
1.3 KiB
Plaintext
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5 rem Plot Gaussian distribution in two dimensions
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10 text: home: PRINT "Std. Dev. = ";: input s1
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20 hgr: hcolor = 3
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30 w = 279: h = 159
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40 w0 = w - 100: w1 = w0/10
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45 h1 = h - 100: h2 = h - 60
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50 k = 0.5: m = 1 / (2 * 3.14159265 * s1 * s1)
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60 for i = 0 to 10 step k
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70 x = 10 * i + 1: y = 10 * i + h1
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75 hplot x,y
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80 for j = 0 to w0 step 1
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85 j1 = 10 * j / w0
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90 d1 = abs(5 - i)
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100 d2 = abs(5 - j1)
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110 r2 = (d1*d1+d2*d2)/(2*s1*s1)
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120 g = exp(-r2)/(2*3.14159*s1*s1)
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130 a = int((h2 * g)/ m)
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140 x = 10 * i + w1 * j1 + 1
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150 y = 10 * i + h1 - a
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160 hplot to x,y
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170 if (i = 0) goto 265
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175 if (j = w0) goto 190
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180 j2 = int(j/10): if ((j/10) <> j2) goto 290
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190 d1 = abs(5 - i + k)
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200 d2 = abs(5 - j1)
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210 r2 = (d1*d1+d2*d2)/(2*s1*s1)
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220 u = exp(-r2)/(2*3.14159*s1*s1)
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225 a1 = int((h2 * u)/ m)
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230 x1 = 10 * (i - k) + w1 * j1 + 1
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240 y1 = 10 * (i - k) + h1 - a1
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245 rem if (y <= y1) goto 290
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250 hplot to x1,y1
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260 hplot x,y
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265 if (j = 0) goto 310
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270 if (i < 10) goto 290
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275 if (j = w0) goto 295
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280 j2 = int(j/10): if ((j/10) = j2) goto 295
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290 hcolor = 0
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295 hplot to x,10 * i + h1
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300 hcolor = 3
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305 hplot x,y
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310 next j
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320 next i
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330 hplot w+1,h: hplot to 100+1,h: hplot to 0+1,h1
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340 vtab 21: print "Gaussian (standard deviation = ";s1;")"
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350 print "Plot from -5.0 to + 5.0"
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360 print "Peak value = "m
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