Invalid expression. Check for missing or extra characters.

Hi

When I run my code I got an error message "Invalid expression. Check for missing or extra characters" for my if loop.

I am not sure why. Someone there can help me?

GHGS = (zx(:,[151+[-1 0 1]])-zx(:,[131+[-1 0 1]]))/20;
    GHGN = (zx(:,[171+[-1 0 1]])-zx(:,[151+[-1 0 1]]))/20;
    for i=1:nx
        if 
         GHGS > 0
         fprintf('The point is blocked')
        elseif
         GHGN < -10
         fprintf('The point is blocked')
        else
         blocks(i)=blocks(i)+1;   
        end    
    end

[Adam]

At a guess I would say it comes from splitting your if condition across 2 linies, though I haven't tested it.

Try

if GHGS > 0

all on one line instead.

You can split code across multiple lines, but it need the first line to end with ... to show that the same statement continues on the next line, otherwise Matlab will expect a complete statement on the first line.

Answer 1

[madhan ravi]

GHGS = (zx(:,[151+[-1 0 1]])-zx(:,[131+[-1 0 1]]))/20;
    GHGN = (zx(:,[171+[-1 0 1]])-zx(:,[151+[-1 0 1]]))/20;
    for i=1:nx
        if GHGS > 0                     %change your lines to this as one line        
         fprintf('The point is blocked')
        elseif GHGN < -10               %change your lines to this as one line
         fprintf('The point is blocked')
        else
         blocks(i)=blocks(i)+1;   
        end    
    end

Answer 2

[KALIVARAPU Rama Kumara Teja]

The equation is in .mlx file and I saved as .m file to paste the code(syntex) for .mfile execution. facong below error :

% Mutual Inductance

g = 1.3 ; % constant value for square shape.

n1 = 5 ; % number of turns in primary coil

n2 = 4 ; % number of turns in secondary coil

r_i = % radius of ith turn in primary coil

r_j = % radius of jth turn in secondary coil

d_12 = 30 ; % distance between coils,mm

M=g\sum_{i=1}^{n1}\sum_{j=1}^{n2}(M_ij,r_i,r_j,d_12)

> squarecoil

Error: File: squarecoil.m Line: 53 Column: 44

Invalid expression. Check for missing or extra characters.

Can someone help me for the above equation ?

[Adam]

sum_{i=1}

is not valid syntax. At least I'm pretty sure it isn''t!

Answer 3

[swapna subudhiray]

clear

close all

clc

load X_Gabor_feat

load Y

X=X_Gabor_feat;

clear X_Gabor_feat

for i=1:10

per=70;

c=cvpartition(Y,'HoldOut',1-(per/100));

train_loc=c.training;

test_loc=~train_loc;

X_train=X(train_loc,:);

Y_train=Y(train_loc,:);

X_test=X(test_loc,:);

Y_test=Y(test_loc,:);

Mdl=fitcknn(X_train,Y_train);

[obt_class,~]=predict(Mdl,X_test);

[oa(i), aa(i), K(i), ua(:,i)]=perf_measure(Y_test,obt_class);

end

disp('OA : mean std');

[mean(oa);std(oa)]

disp('AA : mean std');

[mean(aa);std(aa)]

disp('K : mean std');

[mean(K);std(K)]

disp('UA :');

mean(ua')

getting invalid erroe expression..please help me out

Answer 4

[sudirman]

blinking

Error: File: blinking.m Line: 2 Column: 11

Invalid expression. Check for missing or extra characters.

Answer 5

[sudirman]

blinking

Error: File: blinking.m Line: 2 Column: 11

Invalid expression. Check for missing or extra characters.

Answer 6

[sudirman]

>> blinking

Error: File: blinking.m Line: 2 Column: 11

Invalid expression. Check for missing or extra characters.

Answer 7

[sudirman]

>> blinking

Error: File: blinking.m Line: 2 Column: 11

Invalid expression. Check for missing or extra characters.

papan = arduino();

dipimpin =