Caused by: MATLAB expression '<output of containers.Map>' is not numeric.

I created a code in matlab SIMULINK using matlab function. But it keeps saying

Caused by: MATLAB expression '<output of containers.Map>' is not numeric.

Pasting the code for reference, thanks.

function activePlants = ctp(costs, loads, capacities)
coder.extrinsic('containers.Map')
costToPlant=zeros();
costToPlant = containers.Map('KeyType', 'double', 'ValueType', 'double');

for plant = 1:length(costs)
    costToPlant(costs(plant)) = plant;
end

sortedCosts = sort(costs);
for loadIndex = 1:length(loads)
    netCapacity = 0;
    activePlants =zeros();
    
    costIndex = 1;
    while costIndex <= length(sortedCosts)
        currentPlant = costToPlant(sortedCosts(costIndex));
        
        if netCapacity >= loads(loadIndex)
            break;
        else
            netCapacity = netCapacity + capacities(currentPlant);
            activePlants = [activePlants, costs(currentPlant)];
        end
        
        costIndex = costIndex + 1;
    end
    
    if netCapacity >= loads(loadIndex)
        fprintf('Active Plants for load %int8: %s\n', loads(loadIndex), (activePlants));
    else
        fprintf('Insufficient capacity for load %int8\n', loads(loadIndex));
    end
    disp(loads(loadIndex),(activePlants))
end
% Example arrays
%capacities = [3, 4, 5];
%loads = [7, 5, 8];
%activePlants = myFunction(costs, loads, capacities);
end

Answer 1

[Walter Roberson]

costToPlant=zeros();
costToPlant = containers.Map('KeyType', 'double', 'ValueType', 'double');

You initialize costToPlant as an empty double precision array.

Then you try to store containers.Map onto the same variable.

In Simulink, the datatype of a variable is determined by the first assignment to a variable. Once you have assigned a double precision datatype to costToPlant you cannot change the variable to containers.Map .

The fix is easy: just leave out the initialization to zeros()