Operands to the || and && operators must be convertible to logical scalar values.

Question

Diana Das Angeloose 2014-7-28

3
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/143576-operands-to-the-and-operators-must-be-convertible-to-logical-scalar-values

评论： Walter Roberson 2023-7-22

%%Spectrometer or Ionisation
if ~iscell(folders) && isnan(folders) && strcmpi(Type,'Io')
 folders={'i1'};
elseif ~iscell(folders) && isnan(folders) && strcmpi(Type,'Sp1')
  folders={'s1'};

is the code how to solve the error

Operands to the and && operators must be convertible to logical scalar values.Error in SearchMCfiles_mp (line 33) if ~iscell(folders) && isnan(folders) && strcmpi(Type,'Io')

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Carlos David Albarracin 2023-7-22

Warning: Error occurred while executing the listener callback for event MLFB defined for class

slmle.internal.slmlemgr:

Operands to the logical AND (&&) and OR (||) operators must be convertible to logical scalar values. Use the ANY or

ALL functions to reduce operands to logical scalar values.

Error in slmle.internal.MLFBEditor/callback

Error in slmle.internal.MLFBEditor/init>@(varargin)obj.callback(varargin{:})

Error in slmle.internal.slmlemgr/action

Error in slmle.internal.slmlemgr/init>@(varargin)obj.action(varargin{:})

Error in message.internal.executeCallback

Warning: Error occurred while executing the listener callback for event MLFB defined for class

slmle.internal.slmlemgr:

Operands to the logical AND (&&) and OR (||) operators must be convertible to logical scalar values. Use the ANY or

ALL functions to reduce operands to logical scalar values.

Error in slmle.internal.MLFBEditor/callback

Error in slmle.internal.MLFBEditor/init>@(varargin)obj.callback(varargin{:})

Error in slmle.internal.slmlemgr/action

Error in slmle.internal.slmlemgr/init>@(varargin)obj.action(varargin{:})

Error in message.internal.executeCallback

Warning: Error occurred while executing the listener callback for event MLFB defined for class

slmle.internal.slmlemgr:

Operands to the logical AND (&&) and OR (||) operators must be convertible to logical scalar values. Use the ANY

or ALL functions to reduce operands to logical scalar values.

Error in slmle.internal.MLFBEditor/callback

Error in slmle.internal.MLFBEditor/init>@(varargin)obj.callback(varargin{:})

Error in slmle.internal.slmlemgr/action

Error in slmle.internal.slmlemgr/init>@(varargin)obj.action(varargin{:})

Error in message.internal.executeCallback

> In slmle.internal.slmlemgr/action

In slmle.internal.slmlemgr/init>@(varargin)obj.action(varargin{:})

In message.internal.executeCallback

In slmle.internal.MLFBEditor/createToolStripContext

In slmle.internal.MLFBEditor/open

In slmle.internal.slmlemgr/open

In slmle.internal.EMLEditorApi/documentOpen

In open_editor (line 72)

In eml_man (line 56)

In eml_function_man>create_ui (line 169)

In eml_function_man (line 26)

In eml_chart_man>create_ui (line 104)

In eml_chart_man (line 20)

In dispatch_task (line 12)

In eml_man (line 66)

In studio_redirect>try_specialized_editor_open (line 761)

In studio_redirect>open_object (line 775)

In studio_redirect (line 33)

In sfprivate (line 15)

In slsf>blk_open_method (line 784)

In slsf (line 55)

Walter Roberson 2023-7-22

@Carlos David Albarracin

That appears to have to do with Standard Linear Mixed Effect model . I see a hint that maybe some LME code was compiled, but it is difficult to be sure.

My guess is that something came out empty that the code does not expect to be empty. It is difficult to get any hints about exactly what might be happening.

You will probably need to open a support case.

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Answer 1

Patrik Ek 2014-7-28

27
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There is 2 types of logical operators for some operations in matlab. For and can you use either && or & to operator on scalars. However to logically compare vectors (which is done per element), you must use &. If you want to see if two vectors are equal, use the function isequal(a,b) instead. The same applies for | |.

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Chris Smith 2019-11-30

This is perfect. But I must ask, why must you use & when comparing vectors?

Walter Roberson 2019-11-30

&& is the "short circuit" and operation, that does not evaluate the right hand side if the left hand side is false. But when you are working with vectors, true or false of the left hand side is element-by-element, and it isn't really possible to only evaluate the right hand side with respect to selected elements. So && and || are simply not permitted except on scalars, by definition.

Note: if you are using && or || chances are strong that you should be considering using any() or all() . Sometimes it make sense to use all(condition1)&&all(condition2)

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Answer 2

Evan Ekblaw 2020-9-11

5
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https://ww2.mathworks.cn/matlabcentral/answers/143576-operands-to-the-and-operators-must-be-convertible-to-logical-scalar-values#answer_493159

编辑：Walter Roberson 2022-2-24

在 MATLAB Online 中打开

while xf>=360 && xf<=390
    tries=tries+1;
    
    [v0,theta]=swing_choices();
    angle=theta*34*(pi/180);
    v0=v0*(cos(angle));
    
    xf=x0+v0*t+.5*a_x*t.^2;
    plot(xf,y,"--k")
    
end

Dont see the error here.

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Steven Lord 2020-9-11

在 MATLAB Online 中打开

What is the size of xf when that first line executes and throws that error?

[true false] && [true true] % Will throw this same error
[true false] &  [true true] % Will return a 1-by-2 logical array

You likely want to use & and wrap that condition in any or all.

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Answer 3

Megha S 2019-6-2

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Operands to the || and && operators must be convertible to logical scalar values.

Error in vol_down (line 8)

if((dwn==0)||(dwn==1))

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Walter Roberson 2019-6-2

Your dwn variable is not a scalar.

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Answer 4

Patrick Benz 2021-3-17

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https://ww2.mathworks.cn/matlabcentral/answers/143576-operands-to-the-and-operators-must-be-convertible-to-logical-scalar-values#answer_650082

编辑：Patrick Benz 2021-3-17

在 MATLAB Online 中打开

I get the same error.

Tiefe<(mu_Tiefe-4*sigma_Tiefe)|| Tiefe>(mu_Tiefe+4*sigma_Tiefe)

Tiefe is an 696x1 array.

When I'm only copying the left or the right part into the command Window, I get logical arrays with 696x1.

When I change to code to:

Tiefe<(mu_Tiefe-4*sigma_Tiefe)| Tiefe>(mu_Tiefe+4*sigma_Tiefe)

it works. But do I have a logical error in my code?

I want to check if every value in the array "Tiefe" is matching one of the two conditions.

Or is there a better option to compare arrays with scalar values?

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Walter Roberson 2021-3-17

在 MATLAB Online 中打开

Tiefe<(mu_Tiefe-4*sigma_Tiefe)|| Tiefe>(mu_Tiefe+4*sigma_Tiefe)

in MATLAB, the || operator is the "short-circuit or" operator, and can only be used if the two sides compute scalars. "short-circuit or" means that the first expression, which must be scalar, is computed, and if it is found to be (scalar) non-zero value, that the second expression is literally not computed.

The | operator on the other hand, is element-wise logical or, and when two arrays of comptible size are present, it computes each element on the left "or" the element on the right, doing array expansion if needed. The result is a logical array of size implied by any necessary expansions.

Notice that you are checking to see if a value is less than a value, or more than a different value. The result would be false if the value is inside the two boundaries, such as -5 < -3 | -5 > 1 is true, and 7 < -3 | 7 > 1 is true, but 0 < -3 | 0 > 1 is false. So the code is equivalent to

~(mu_Tiefe-4*sigma_Tiefe <= Tiefe & Tiefe <= mu_Tiefe-4*sigma_Tiefe)

It is valid to test to see if a value is outside a particular range, but humans usually find it easier to read and understand a test to check to see whether a value is inside a particular range

The test could also be written

abs(Tiefe - mu_Tiefe) > 4*sigma_Tiefe

Walter Roberson 2021-3-17

在 MATLAB Online 中打开

If you truncate the distribution then it will not be able to generate values outside the range, so there would be no need to test.

mu_Tiefe = 2;

sigma_Tiefe = .2;

pd = makedist('Normal', mu_Tiefe, sigma_Tiefe);

td = truncate(pd, mu_Tiefe-4*sigma_Tiefe, mu_Tiefe+4*sigma_Tiefe);

rng(655321);

Tiefe_1 = random(pd, 1, 100000);

rng(655321);

Tiefe_2 = random(td, 1, 100000);

mask1 = Tiefe_1<(mu_Tiefe-4*sigma_Tiefe)| Tiefe_1>(mu_Tiefe+4*sigma_Tiefe);

mask2 = Tiefe_2<(mu_Tiefe-4*sigma_Tiefe)| Tiefe_2>(mu_Tiefe+4*sigma_Tiefe);

nnz(mask1)

ans = 4

Tiefe_1(mask1)

ans = 1×4

1.1288 2.8282 2.8564 1.1942

nnz(mask2)

ans = 0

Tiefe_2(mask2)

ans = 1×0 empty double row vector

plot(1:100, Tiefe_1(1:100), 'k', 1:100, Tiefe_2(1:100), 'b');

Patrick Benz 2021-3-24

I will try this way, thx

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Answer 5

lakshmi Shree B 2022-2-24

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Operands to the logical and (&&) and or (||) operators must be convertible to logical scalar values.

Error in test_ppg (line 9)

if (file == 0) && (path == 0)

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Walter Roberson 2022-2-24

在 MATLAB Online 中打开

Your code is trying to test whether the user canceled on a call to uigetfile or uiputfile

Although it is true that file and path will both be returned as 0 if that happens, consider the case where the user does not cancel. In such a case, you would be comparing a vector of characters to binary 0 on the left side of the && getting a logical vector on the left. But unless the user just happened to select a file with a one-character name (including extension), that would be an error on the left because && cannot operate on vectors. And on the right hand side, the path is certainly going to be more than one character if the user did not cancel, and so the == is going to be a vector and so would fail the && requirements.

There is no situation in which you can get a numeric 0 for the path in which you did not also get a numeric 0 for the file name, so there is no need to test both variables so you do not need the && part.

What I recommend as the test for cancel is

if isnumeric(file)

This can only be true if the user canceled, and will be a scalar.

This test is also compatable with the possibility that you coded a uigetfile() with 'MultiSelect', 'on' -- a case in which the file output would be a cell array of character vectors if the user selected more than one file, but would be a character vector if the user selected only one file, and would be numeric 0 if the user canceled.

To handle multiselect, I suggest

 if isnumeric(file)
    %case where user canceled
 end
file = cellstr(file);

If the user selected only one file, then the cellstr() will wrap the character vector with {} turning it into a cell array of character vector. But if the user selected more than one file so that file is already a cell array of character vectors, then cellstr() will leave it unmodified. Thus either way after the cellstr() call, file will be a cell array of character vectors. This logic avoids having to treat the single-file case differently than the multi-file case.

lakshmi Shree B 2022-2-25

[file,path ] = uigetfile('*.dat');

Its a video input (mp4 converted to dat file)

Walter Roberson 2022-2-25

在 MATLAB Online 中打开

[file, filedir] = uigetfile('*.dat');
if isnumeric(file)
    return;   %user cancel
end
filename = fullfile(filedir, file);

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Operands to the || and && operators must be convertible to logical scalar values.

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