Function does not return all declared outputs

The following function has three declared outputs. Although each output is correctly calculated, function returns only output variable #1 in the row (verified by changing position of the variables), like there would be only one output variable declared.

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function [rRollAltAgl, rPitchAltAgl, rRollIas] = evRisk(raw_vector)
%raw_vector = input(prompt);
roll    = raw_vector(1);
pitch   = raw_vector(2);
ias     = raw_vector(3);
altAGL  = raw_vector(4);

% ----rRoll_AltAGL Calculation
rRollAltAgl = evalfis(fisStructRoll_AltAGL,[roll altAGL]);

% ----rPitch_AltAGL Calculation
rPitchAltAgl = evalfis(fisStructPitch_AltAGL,[pitch altAGL]);

% ----rRoll_IAS Calculation
% Roll_IAS Excess Over Stall
rollRad = roll*(pi/180); % bank in degrees to radians
GInc = sec(rollRad); % load increase (roll secans)
stallIAS = 72; % stall speed clean config
stallInc = stallIAS * sqrt(GInc); % stall speed increase
iasExc = ias/stallInc; % excess of speed over stall speed
rollIASOutput = (iasExc-1)*100; % value for calculations
% Roll_IAS Risk Assement
if rollIASOutput > 50
   rRollIas = 10;
elseif rollIASOutput > 45
   rRollIas = 20;
elseif rollIASOutput > 40
   rRollIas = 30;
elseif rollIASOutput > 35
   rRollIas = 40;
elseif rollIASOutput > 30
   rRollIas = 50;
elseif rollIASOutput > 25
   rRollIas = 60;
elseif rollIASOutput > 20
   rRollIas = 70;
elseif rollIASOutput > 15
   rRollIas = 80;
else
   rRollIas = 90;
end

end

function Roll_AltAGL_4C = fisStructRoll_AltAGL(~)
Roll_AltAGL_4C = getFISCodeGenerationData('Roll_AltAGL.fis');
end

function Pitch_AltAGL_4C = fisStructPitch_AltAGL(~)
Pitch_AltAGL_4C = getFISCodeGenerationData('Pitch_AltAGL.fis');
end

[Walter Roberson]

Please show an example of evaluating it.

It would help to have your two .fis files to test with.

[Artur Bogdanowicz]

I have created a simple .mlx calling this function and delivering input vector.

raw_vector = [30 0 120 2456]

risk_calc = evRisk(raw_vector)

This script returns just one value, always the one that is on the position #1 in output variables declaration. This function is a prepration for Matlab Coder, but I am able to compare the evaluation with my different script and I am pretty confident that evalfis produces correct number.

Unfortunately .fis files seem not to be supported (am I right?) and can't be attached here.

Cannot attach this file because:

• File format is unsupported for files:Roll_AltAGL.fis,Pitch_AltAGL.fis. Use any of these formats:.bmp, .csv, .fig, .gif, .jpg, .jpeg, .m, .mat, .mdl, .mlapp, .mlx, .sfx, .slx, .sbproj, .pdf, .png, .txt, .xls, .xlsx, .zip

[Walter Roberson]

You can zip other kinds of files and attach the .zip

[Artur Bogdanowicz]

Of course! Here they are.

Answer 1

[Walter Roberson]

risk_calc = evRisk(raw_vector)

That requests that the first (positional) output be assigned to risk_calc and that any other outputs be discarded.

Remember that MATLAB only ever assigns positionally (though syms arguably violates that). If you have a function

function [A, B, C] = whatever()

and the function call does not have three outputs, then MATLAB will not assign to B and C inside the calling function: it will just discard those outputs.

MATLAB also does not bundle all of the outputs into a single cell array. In the above case, it is not going to check whether three outputs were asked for and if so assign the correspondingly, but if only one output were asked for then put the three outputs into a cell array and assign that -- that sort of thing is never done.

If you want three outputs, then assign to three variables.

[risk_calc, rPa, rPi] = evRisk(raw_vector);