Matlab interp2

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Matlab interp2

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Help Center Help Center. Gridded data consists of values or measurements at regularly spaced points that form a grid. Gridded data arises in many areas, such as meteorology, surveying, and medical imaging. In these areas, it is common to take measurements at regular spatial intervals, possibly over time. These ordered grids of data can range from 1-D for simple time series to 4-D for measuring volumes over time or higher. Some examples of gridded data are:. In all of these applications, grid-based interpolation efficiently extends the usefulness of the data to points where no measurement was taken. For example, if you have hourly price data for a stock, you can use interpolation to approximate the price every 15 minutes. The meshgrid and ndgrid functions create grids of various dimensionality. These functions return grids using different output formats.

Matlab interp2

Help Center Help Center. The griddata function interpolates the surface at the query points specified by xq,yq and returns the interpolated values, vq. The surface always passes through the data points defined by x and y.

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Requested x Out of range values are returned as NaNs. Alternatively, you could use griddedInterpolant , which allows you to explicitly assign an algorithm to the extrapolated points:. But it gave me following error;. Error in Untitled12 line That seems doubtful. I wanted to know what interp2 does when you have data on the edge for example the point where the X is. Edited: kristian stokkereit on 20 Aug Thank you. Edited: Matt J on 7 Jul I think we can be pretty confident that the obvious generalization to the 2D case is used for interp2.

As you can see, the output image has more data points as compared with the original one. The x and y vector is the input matrices, and they should have the same size.

Anyway it is not big deal, I'm only interested in what happens now. Based on your location, we recommend that you select:. I do not understand what I am doing as the input fields obviously match in size because they are from the same array. The boundary handling is descriibed in the section Boundary Condition of this Cubic interpolation reference. I believe the computation of the derivatives for the extrapolation defined in your original post would be as below. Thanks so much for your help! Matrix or array of the same size as Xq and Yq. Grid must have uniform spacing in each dimension, but the spacing does not have to be the same for all dimensions. John D'Errico on 16 Jun For best results, provide X and Y as vectors. In your case you could avoid using the eval, by using a dynamic name for the column in your tables. More About collapse all Strictly Monotonic A set of values that are always increasing or decreasing, without reversals.