MATLAB: Double interpolation using lookup tables in matlab

double interpolationMATLAB

hi, i want to create a code that interpolates 2 dimensional data using the method shown in the attached pictures. To clarify, the example in the attachements was calculating the value when angle of attack is 35 degrees and aileron deflection is 2.5 degrees, and we have to interpolate to get the value. I am having a problem converting the formulas into a code that interpolates. Please help.

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[x,y]=meshgrid(25:5:50,-10:5:15);
z=[59 76 91 107 122 137;78 98 116 133 149 164;101 127 148 167 184 197;127 155 177 197 214 227;180 212 235 253 266 273;258 289 314 333 346 352];
k=interp2(x,y,z,35,2.5);

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Note that there are not only numbers in that string, it also contains 'S' characters apparently at random, e,g.:

>> f(8480:8500)
ans =
3 -118 S 623 1623 -71
%      ^ not digit character!

One simple and efficient solution is to remove those 'S' characters before using sscanf:

v = sscanf(strrep(f,'S',''),'%d');

This correctly returns all 4297 numbers in the string, and can be easily adapted (e.g. using regexprep to remove specific types of characters, e.g. if it is possible that other alphabetic characters might occur in the string).

The simplest and most efficient solution by far is this:

v = sscanf(f,'%d%*[S ]');

Nothing will beat that simple command in terms of simplicity or speed.

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(z - z1).*(z - z2).*(z - z3).*(z - z4) + (z - z1).*(z - z2).*(z - z3).*(z - z5) + (z - z1).*(z - z2).*(z - z4).*(z - z5) + (z - z1).*(z - z3).*(z - z4).*(z - z5) + (z - z2).*(z - z3).*(z - z4).*(z - z5)

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MATLAB: How to convert a char into double

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