How to get answer from this else if code

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Fateme Jalali
Fateme Jalali 2016-3-7
编辑： Walter Roberson 2016-3-7
Hello.I wrote matlab code below. when I change value of parameter num_modes to 5 or 6, the answer should be 'result2:graphic or <text> block' or two next conditions in program.But for every values of num_modes my code shows one of first two if results.can any one help me to correct my codes?
clc;
clear all;
close all;
%calculate comulative probibility
num_modes=5
matrix_comulative_probibility(1)=1.5;
matrix_comulative_probibility(2)=0.562;
matrix_comulative_probibility(3)=1.5;
matrix_comulative_probibility(4)=0;
T1=0.3;
T2=128;
T3=70;
%if num_modes==0
%disp('result2:smooth block or background')
if num_modes==1&&matrix_comulative_probibility(1)>T1;
disp('result2:background block');
elseif 1<num_modes<=3&&matrix_comulative_probibility(1)+matrix_comulative_probibility(2)>T1&&0<=abs(matrix_comulative_probibility(1)-matrix_comulative_probibility(2))<=1.5;
disp('result2:text block');
elseif num_modes<=4&&matrix_comulative_probibility(1)+matrix_comulative_probibility(2)+matrix_comulative_probibility(3)+matrix_comulative_probibility(4)>T1;
disp('result2:graphic or <text> block');
elseif num_modes>4&&matrix_comulative_probibility(1)+matrix_comulative_probibility(2)+matrix_comulative_probibility(3)+matrix_comulative_probibility(4)<T3;
disp('result2:image block');
else
disp('result2:undetected <image> block');
end

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采纳的回答

Walter Roberson
Walter Roberson 2016-3-7
编辑：Walter Roberson 2016-3-7
1<num_modes<=3 means ((1<num_modes)<=3) . The (1<num_modes) part will return either 0 (false) or 1 (true), and 0 and 1 are both <=3 so the condition will always be true.
You need
1 < num_modes && num_modes <= 3

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