MATLAB: Error In finding a variable inside a nested loop..

plot

I am getting an error of "Operands to the || and && operators must be convertible to logical scalar values". Here, I need to plot figure(2), figure(3). i don't understand how to solve this. Any help is very much appreciated. I am attachhing my code here.

Best Answer

The code you posted cannot encounter that error unless you uncomment some code. If you do uncomment, then

elseif lambdat(:,:) > 0.34522         pi/2 - lambdam pi/2 + lambdam  0.34522 < lambdat(:,:) &&

What would be the intent of that code? MATLAB would parse it like

    elseif lambdat(:,:) > 0.34522
        pi/2 - lambdam
        pi/2 + lambdam
        0.34522 < lambdat(:,:) &&

complete with an error because the statement is not finished on the line.

Your lambdat is a non-scalar. When you test a non-scalar in an if or elseif the condition is only considered true if all of the values are non-zero . So if some of the lambdat values are > 0.34522 but not all of them are, then the condition would fail.

You should probably be using logical indexing, or else using a loop so you are only testing one value at a time.

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MATLAB: Operator error for loop

In MATLAB, a for statement must have one of the following syntaxes:

for variable = scalar_value : scalar_value
for variable = scalar_value : scalar_value : scalar_value
for variable = scalar_value
for variable = nonscalar_value

In the above, variable_name must be a simple un-indexed name.

In the above, scalar_value and nonscalar_value can be expressions that evaluate to a scalar value or nonscalar value.

Basically, the syntax is really just

for variable = expression

except that the cases with : are optimized internally.

It would thus be valid to write

for control = idxGPS > 1

As your idxGPS is scalar numeric, idxGPS > 1 would be scalar, either 0 (false) or 1 (true), and that value would be assigned to the variable for one iteration.

If you wanted to only do the body once if the condition held, and for some reason you really had an urge to use a for instead of the more straight-forward if then you could do

for control = true : idxGPS > 1

That would do the body of the loop once and only in the case that idxGPS > 1

Your code is missing a bunch of "end" statements, and appears to have improper nesting.

Your code uses otherwise which is restricted for use in a switch() statement, but you are not using a switch statement.

If you have a hankering to execute exactly one of those sections in an obscure but legal way, then

switch true
    case idxGPS > 1
        stuff
    case idxGLONASS > 1
        stuff
    otherwise
        stuff
end

MATLAB: How to create 200 random matrices using loop..

Try this:

tic;
inputMatrix = rand(32, 32); % Whatever you want...
for k = 1 : 200
  thisRandomMatrix = rand(32,32); % Create new random matrix for this iteration.
  storedMatrixes{k} = inputMatrix .* thisRandomMatrix ; % Multiply them
end
toc;
msgbox('Done with loop');

Best Answer

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MATLAB: Operator error for loop

MATLAB: How to create 200 random matrices using loop..

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