Positionen bestimmter Einträge in einem Array finden

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	Beiträge: 13

	Anmeldedatum: 05.12.11

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Verfasst am: 09.01.2012, 23:16 Titel: Positionen bestimmter Einträge in einem Array finden

Hallo,
ich möchte in einem Array die Position bestimmter Einträge herausfinden. In einem zweiten Array habe ich die Zahlen, die ich im ersten Array suche, allerdings stehten im ersten Array Kommazahlen und im zweiten ganze Zahlen. Jetzt möchte ich die Position, die am dichtesten an der Zahl liegt, die im zweiten Array steht.
Hier mal die zwei Arrays, bei denen ich das anwenden will:

Code:

X=[1,2.24750000000000,3.49500000000000,4.74250000000000,5.99000000000000,7.23750000000000,8.48500000000000,9.73250000000000, ...
10.9800000000000,12.2275000000000,13.4750000000000,14.7225000000000,15.9700000000000,17.2175000000000,18.4650000000000, ...
19.7125000000000,20.9600000000000,22.2075000000000,23.4550000000000,24.7025000000000,25.9500000000000,27.1975000000000, ...
28.4450000000000,29.6925000000000,30.9400000000000,32.1875000000000,33.4350000000000,34.6825000000000,35.9300000000000, ...
37.1775000000000,38.4250000000000,39.6725000000000,40.9200000000000,42.1675000000000,43.4150000000000,44.6625000000000, ...
45.9100000000000,47.1575000000000,48.4050000000000,49.6525000000000,50.9000000000000,52.1475000000000,53.3950000000000, ...
54.6425000000000,55.8900000000000,57.1375000000000,58.3850000000000,59.6325000000000,60.8800000000000,62.1275000000000, ...
63.3750000000000,64.6225000000000,65.8700000000000,67.1175000000000,68.3650000000000,69.6125000000000,70.8600000000000, ...
72.1075000000000,73.3550000000000,74.6025000000000,75.8500000000000,77.0975000000000,78.3450000000000,79.5925000000000, ...
80.8400000000000,82.0875000000000,83.3350000000000,84.5825000000000,85.8300000000000,87.0775000000000,88.3250000000000, ...
89.5725000000000,90.8200000000000,92.0675000000000,93.3150000000000,94.5625000000000,95.8100000000000,97.0575000000000, ...
98.3050000000000,99.5525000000000,100.800000000000,102.047500000000,103.295000000000,104.542500000000,105.790000000000, ...
107.037500000000,108.285000000000,109.532500000000,110.780000000000,112.027500000000,113.275000000000,114.522500000000, ...
115.770000000000,117.017500000000,118.265000000000,119.512500000000,120.760000000000,122.007500000000,123.255000000000, ...
124.502500000000,125.750000000000,126.997500000000,128.245000000000,129.492500000000,130.740000000000,131.987500000000, ...
133.235000000000,134.482500000000,135.730000000000,136.977500000000,138.225000000000,139.472500000000,140.720000000000, ...
141.967500000000,143.215000000000,144.462500000000,145.710000000000,146.957500000000,148.205000000000,149.452500000000, ...
150.700000000000,151.947500000000,153.195000000000,154.442500000000,155.690000000000,156.937500000000,158.185000000000, ...
159.432500000000,160.680000000000,161.927500000000,163.175000000000,164.422500000000,165.670000000000,166.917500000000, ...
168.165000000000,169.412500000000,170.660000000000,171.907500000000,173.155000000000,174.402500000000,175.650000000000, ...
176.897500000000,178.145000000000,179.392500000000,180.640000000000,181.887500000000,183.135000000000,184.382500000000, ...
185.630000000000,186.877500000000,188.125000000000,189.372500000000,190.620000000000,191.867500000000,193.115000000000, ...
194.362500000000,195.610000000000,196.857500000000,198.105000000000,199.352500000000,200.600000000000,201.847500000000, ...
203.095000000000,204.342500000000,205.590000000000,206.837500000000,208.085000000000,209.332500000000,210.580000000000, ...
211.827500000000,213.075000000000,214.322500000000,215.570000000000,216.817500000000,218.065000000000,219.312500000000, ...
220.560000000000,221.807500000000,223.055000000000,224.302500000000,225.550000000000,226.797500000000,228.045000000000, ...
229.292500000000,230.540000000000,231.787500000000,233.035000000000,234.282500000000,235.530000000000,236.777500000000, ...
238.025000000000,239.272500000000,240.520000000000,241.767500000000,243.015000000000,244.262500000000,245.510000000000, ...
246.757500000000,248.005000000000,249.252500000000,250.500000000000,251.747500000000,252.995000000000,254.242500000000, ...
255.490000000000,256.737500000000,257.985000000000,259.232500000000,260.480000000000,261.727500000000,262.975000000000, ...
264.222500000000,265.470000000000,266.717500000000,267.965000000000,269.212500000000,270.460000000000,271.707500000000, ...
272.955000000000,274.202500000000,275.450000000000,276.697500000000,277.945000000000,279.192500000000,280.440000000000, ...
281.687500000000,282.935000000000,284.182500000000,285.430000000000,286.677500000000,287.925000000000,289.172500000000, ...
290.420000000000,291.667500000000,292.915000000000,294.162500000000,295.410000000000,296.657500000000,297.905000000000, ...
299.152500000000,300.400000000000,301.647500000000,302.895000000000,304.142500000000,305.390000000000,306.637500000000, ...
307.885000000000,309.132500000000,310.380000000000,311.627500000000,312.875000000000,314.122500000000,315.370000000000, ...
316.617500000000,317.865000000000,319.112500000000,320.360000000000,321.607500000000,322.855000000000,324.102500000000, ...
325.350000000000,326.597500000000,327.845000000000,329.092500000000,330.340000000000,331.587500000000,332.835000000000, ...
334.082500000000,335.330000000000,336.577500000000,337.825000000000,339.072500000000,340.320000000000,341.567500000000, ...
342.815000000000,344.062500000000,345.310000000000,346.557500000000,347.805000000000,349.052500000000,350.300000000000, ...
351.547500000000,352.795000000000,354.042500000000,355.290000000000,356.537500000000,357.785000000000,359.032500000000, ...
360.280000000000,361.527500000000,362.775000000000,364.022500000000,365.270000000000,366.517500000000,367.765000000000, ...
369.012500000000,370.260000000000,371.507500000000,372.755000000000,374.002500000000,375.250000000000,376.497500000000, ...
377.745000000000,378.992500000000,380.240000000000,381.487500000000,382.735000000000,383.982500000000,385.230000000000, ...
386.477500000000,387.725000000000,388.972500000000,390.220000000000,391.467500000000,392.715000000000,393.962500000000, ...
395.210000000000,396.457500000000,397.705000000000,398.952500000000,400.200000000000,401.447500000000,402.695000000000, ...
403.942500000000,405.190000000000,406.437500000000,407.685000000000,408.932500000000,410.180000000000,411.427500000000, ...
412.675000000000,413.922500000000,415.170000000000,416.417500000000,417.665000000000,418.912500000000,420.160000000000, ...
421.407500000000,422.655000000000,423.902500000000,425.150000000000,426.397500000000,427.645000000000,428.892500000000, ...
430.140000000000,431.387500000000,432.635000000000,433.882500000000,435.130000000000,436.377500000000,437.625000000000, ...
438.872500000000,440.120000000000,441.367500000000,442.615000000000,443.862500000000,445.110000000000,446.357500000000, ...
447.605000000000,448.852500000000,450.100000000000,451.347500000000,452.595000000000,453.842500000000,455.090000000000, ...
456.337500000000,457.585000000000,458.832500000000,460.080000000000,461.327500000000,462.575000000000,463.822500000000, ...
465.070000000000,466.317500000000,467.565000000000,468.812500000000,470.060000000000,471.307500000000,472.555000000000, ...
473.802500000000,475.050000000000,476.297500000000,477.545000000000,478.792500000000,480.040000000000,481.287500000000, ...
482.535000000000,483.782500000000,485.030000000000,486.277500000000,487.525000000000,488.772500000000,490.020000000000, ...
491.267500000000,492.515000000000,493.762500000000,495.010000000000,496.257500000000,497.505000000000,498.752500000000,500];

Y=[10,50,100,150,200,300,400];

Funktion ohne Link?

Als Ansatz habe ich gemacht:

Code:

kk = 0;
for ii=1:size(X,2)
for jj=1:size(Y,2)
if (round(X(ii)) == Y(jj))
kk = kk+1;
position(kk) = ii;
end
end
end

Funktion ohne Link?

dann bekomme ich

Code:

position = [8,40,80,241,321]

Funktion ohne Link?

da hat er aber die Position von 400 nicht gefunden, denn mit dem normalen round rundet er nicht auf 400.

Gibt es da vielleicht eine passende Funktion, oder wie könnte ich das geschickt machen?

Vielen Danke schon einmal für eure Tipps!

Harald

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	Beiträge: 24.501

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Verfasst am: 10.01.2012, 00:10 Titel:

Hallo,

ich würde den Code eher so schreiben:

Code:

BestIndex = zeros(size(Y));
BestDist = zeros(size(Y));

for I=1:length(Y)
[BestDist(I), BestIndex(I)] = min(abs(X - Y(I)));
end
nearestVals = X(BestIndex)

Funktion ohne Link?

Das scheint mir das zu tun, was du dir vorstellst.

Grüße,
Harald

Numinis

Themenstarter

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	Anmeldedatum: 05.12.11

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Verfasst am: 10.01.2012, 14:48 Titel:

Hey, danke!
Das ist genau was ich brauche.


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