To find thresholded image

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MatLab

Hello, Here is the code I have written for thresholding an image. But its giving the error as illegel if statement use. Can anybody help me to correct it.

clc;
close all;
clear all;
 
I = imread('uma.png');
subplot(3,2,1);
imshow(I);
title('Original');
 
% ------------------Check its size-------------------------------------------------- 
[x y]=size(I)
 
% ----------------Grayed image-----------------------------------------------------
gray = rgb2gray(I);
subplot(3,2,2);imshow(gray);
title('Gray image');
 
% Histogram Plotting
 subplot(3,2,3);imhist(gray,64);
title('Histogram');
 

% Thresholding an image
T=20;
cnt = 0;
x =0;y=0;
for i = 1:1:x+1
    
    for j = 1:1:y+1
        {
            if {gray(i,j)=<t;>
                gray(i,j)=0;
             cnt= cnt+1;
            }
        else{
             gray(i,j)=255;
            }
            end
    end
end
 
        figure; imshow(gray);


OR 

 % Thresholding an image


T =20;
c=zeros(size(gray));
[r c1] = size(gray);
allpix=gray(r, c1);
for i=1:r
    for j=1:c1
if allpix(i,j)> T
    c=255;
else
    c=0;
end
    end
end
figure, imshow(c);