linear-interpolation

How to interpolate points between two irregular sets of data?

由 故事扮演 提交于 2019-12-10 18:27:04
问题 I'm sorry for the somewhat confusing title, but I wasn't sure how to sum this up any clearer. I have two sets of X,Y data, each set corresponding to a general overall value. They are fairly densely sampled from the raw data. What I'm looking for is a way to find an interpolated X for any given Y for a value in between the sets I already have. The graph makes this more clear: In this case, the red line is from a set corresponding to 100, the yellow line is from a set corresponding to 50. I

Interpolate missing Data

由 淺唱寂寞╮ 提交于 2019-12-10 11:51:39
问题 I have data in excel , I need fill missing (blank) data, the input data is like: row1 --> 1 2 3 blank 5 6 blank blank 9 10 row2 --> 2 4 blank blank 10 12 14 blank 18 blank the VBA code must read each rows and fill them like : row1 --> 1 2 3 4 5 6 7 8 9 10 row2 --> 2 4 6 8 10 12 14 16 18 20 is there clear solution to do this in VBA(excel)? 回答1: Here is an Example for a mathematical solution: Generate x-values x (we need them as array for the next 2 steps) Calculate the slope m for the given

implementation of interp1 function of MATLAB in J2ME

由 南笙酒味 提交于 2019-12-08 11:58:24
问题 i am looking to implement the interp1, 1-D data interpolation (table lookup), function available in MATLAB in J2ME or JAVA. here is the link http://www.mathworks.com/access/helpdesk/help/techdoc/ref/interp1.html Is there any library available in J2ME or JAVA which has already implemented the same function ? If not can anybody help me in implementing interp1 function in J2ME or JAVA ? 回答1: Example code taken from here (linear only): public static final double[] interpLinear(double[] x, double[

scipy.interpolate.LinearNDInterpolator not producing desired functionality

由 独自空忆成欢 提交于 2019-12-08 05:29:54
问题 I am not getting the desired 2D linear interpolation functionality with LinearNDInterpolator. The following piece of code is trying to do an interpolation between the 4 knot points (0,0), (1,0), (0,1), (1,1). interp2d gives me the expected (linear-interpolated) result but LinearNDInterpolator is doing something else, which I am unable to figure out. Perhaps I am not using the API correctly. Unfortunately, I can't find detailed docs on the usage. Can someone please help or point me to the

imresize bilinear MATLAB

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-07 23:23:53
问题 I try to resize an image with MATLAB and there was something strange to understand directly about imresize function with bilinear mode. I will give you examples to make sure what's the problem. Say, the followings are 1D-matrix. A: [0 1 2] B: [1 2 0 5] the linear interpolation of scaling A to [1,5] in 1D array, so far as I know, makes A: [0, 0.5, 1, 1.5, 2] However, from MATLAB, imresize(A,[1,5],'bilinear') shows [0, 0.4, 1, 1.6, 2.0] Also, imresize(B,[1,5],'bilinear') imresize(B,[1,10],

How can I perform linear interpolation using oracle SQL?

由 ↘锁芯ラ 提交于 2019-12-07 13:55:02
问题 I am trying to use Oracle 11g (11.1 in dev, 11.2 in production) for numeric analysis, specifically linear interpolation on a table which has three columns of interest: a timestamp, a deviceid, and value. The value columns holds data from the device (with id deviceid), taken at the time given in the timestamp. For example, this is bogus data, but it gives the idea: time | deviceid | value ----------------|------------|----------- 01:00:00.000 | 001 | 1.000 01:00:01.000 | 001 | 1.030 01:00:02

what kind of algorithm for generating height-map from contour line?

由 佐手、 提交于 2019-12-07 09:07:26
问题 I'm looking for interpolating some contour lines to generating a 3D view. The contours are not stored in a picture, coordinates of each point of the contour are simply stored in a std::vector. for convex contours : , it seems (I didn't check by myself) that the height can be easily calculates (linear interpolation) by using the distance between the two closest points of the two closest contours. my contours are not necessarily convex : , so it's more tricky... actualy I don't have any idea

interpolation of grouped data using data.table

由 允我心安 提交于 2019-12-07 07:39:11
问题 This is a continuation of a question that I had originally posted at http://r.789695.n4.nabble.com/subset-between-data-table-list-and-single-data-table-object-tp4673202.html . Matthew had suggested that I post my question here so I am doing that now. This is my input below: library(data.table) library(pracma) # for the interp1 function tempbigdata1 <- data.table(c(14.80, 14.81, 14.82), c(7900, 7920, 7930), c("02437100", "02437100", "02437100")) tempbigdata2 <- data.table(c(9.98, 9.99, 10.00),

scipy.interpolate.LinearNDInterpolator not producing desired functionality

由 牧云@^-^@ 提交于 2019-12-06 16:45:43
I am not getting the desired 2D linear interpolation functionality with LinearNDInterpolator. The following piece of code is trying to do an interpolation between the 4 knot points (0,0), (1,0), (0,1), (1,1). interp2d gives me the expected (linear-interpolated) result but LinearNDInterpolator is doing something else, which I am unable to figure out. Perhaps I am not using the API correctly. Unfortunately, I can't find detailed docs on the usage. Can someone please help or point me to the right forum (mathoverflow ?) to write to ? >>> f = interp2d([0,1,0,1], [0,0,1,1], [0,1,2,4]) >>> f(0.5,0.5)

imresize bilinear MATLAB

由 妖精的绣舞 提交于 2019-12-06 13:18:44
I try to resize an image with MATLAB and there was something strange to understand directly about imresize function with bilinear mode. I will give you examples to make sure what's the problem. Say, the followings are 1D-matrix. A: [0 1 2] B: [1 2 0 5] the linear interpolation of scaling A to [1,5] in 1D array, so far as I know, makes A: [0, 0.5, 1, 1.5, 2] However, from MATLAB, imresize(A,[1,5],'bilinear') shows [0, 0.4, 1, 1.6, 2.0] Also, imresize(B,[1,5],'bilinear') imresize(B,[1,10],'bilinear') each, shows [1.0 1.7 1.0 1.5 2.0] [1.0 1.1667 1.16111 1.8889 1.0000 0.1111 1.9444 4.1667 5.0000]
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