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# Mechanical Engineering Helper

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## Charles G

Bachelor of Science, Mechanical Engineering, The Pennsylvania State University

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% ENGR2060 % Lab4 clear; clc; % User input handling: operation = 0; % Operation to perform array = 0; % Array for calcuations % Operation input: fprintf( "Which operation do you wish to perform? \r\n"); fprintf( "(1) Arithmetic mean \r\n(2) Standard deviation \r\n(3) Harmonic mean\r\n" ); % Will loop until enter correct operation value. After error reporting, you % can try again while(1) operation = input( "Insert and press Enter: " ); if((1 ~= length(operation)) || isempty(operation)) fprintf( "Operation must be scalar value. Try again \r\n" ); continue; end if((operation ~= 1) && (operation ~= 2) && (operation ~= 3)) fprintf("Operation value is in ragne [0 3]. Try againg:\r\n"); continue; else break; end end input_number = 0; % Variable holds input numbers % Insert number loop, after some errors you can try again (ex. insert array instead of scalar value) fprintf( "Insert number one by one (-99 is terminating): \r\n" ); while( -99 ~= array( end ) ) input_number = input( "" ); if( 1 ~= length(input_number) ) fprintf( "You can insert numbers only one by one (scalar values). \r\n" ); continue; end array = [ array , input_number ]; end array = array(2:end-1); % Discard terminator and initial zero % Call calculation function val = ASH( operation , array ); % Report result if(1 == operation) fprintf("Arithmetic mean is: %d \r\n" , val); elseif(2 == operation) fprintf("Standard deviation is: %d \r\n" , val); elseif(3 == operation) fprintf("Harmonic mean is: %d \r\n" , val); else error( "Operation value error.\r\n" ); end function ret_val = ASH( operation , array ) %ASH Function calculates Arithmetic mean, %standard deviation or harmonic mean % Input: % operation -> 1, 2 or 3 for am, sd or hm respectively % array -> array to perform calculations % Output: % ret_val -> calculated value of am, sd or hm arr_size = length(array); % Error checking... if(isempty(array) || 1 > arr_size) error( "Array must contain more then one number.\r\n" ); end if(isempty(operation) || 1 ~= length(operation)) error( "Operation must be singe value.\r\n" ); end if((3 < operation) ||(1 > operation)) error( "Operation range is [1 3]\r\n" ); end % Calculations: sumX = 0; tmp = 0; if(1 == operation) sumX = log(prod(exp(array))); ret_val = sumX/arr_size; elseif(2 == operation) sumX = log(prod(exp(array))); meanX = sumX/arr_size; ret_val = sqrt(log(prod(exp((array - meanX).^2)))/(arr_size - 1)); elseif(3 == operation) sumX = log(prod(exp(1./array))); ret_val = arr_size/sumX; else error( "Operation value error.\r\n" ); end end % ASH % ENGR2060 % Lab4 clear; clc; % User input handling: operation = 0; % Operation to perform array = 0; % Array for calcuations % Operation input: fprintf( "Which operation do you wish to perform? \r\n"); fprintf( "(1) Arithmetic mean \r\n(2) Standard deviation \r\n(3) Harmonic mean\r\n" ); % Will loop until enter correct operation value. After error reporting, you % can try again while(1) operation = input( "Insert and press Enter: " ); if((1 ~= length(operation)) || isempty(operation)) fprintf( "Operation must be scalar value. Try again \r\n" ); continue; end if((operation ~= 1) && (operation ~= 2) && (operation ~= 3)) fprintf("Operation value is in ragne [0 3]. Try againg:\r\n"); continue; else break; end end input_number = 0; % Variable holds input numbers % Insert number loop, after some errors you can try again (ex. insert array instead of scalar value) fprintf( "Insert number one by one (-99 is terminating): \r\n" ); while( -99 ~= array( end ) ) input_number = input( "" ); if( 1 ~= length(input_number) ) fprintf( "You can insert numbers only one by one (scalar values). \r\n" ); continue; end array = [ array , input_number ]; end array = array(2:end-1); % Discard terminator and initial zero % Call calculation function val = ASH( operation , array ); % Report result if(1 == operation) fprintf("Arithmetic mean is: %d \r\n" , val); elseif(2 == operation) fprintf("Standard deviation is: %d \r\n" , val); elseif(3 == operation) fprintf("Harmonic mean is: %d \r\n" , val); else error( "Operation value error.\r\n" ); end function ret_val = ASH( operation , array ) %ASH Function calculates Arithmetic mean, %standard deviation or harmonic mean % Input: % operation -> 1, 2 or 3 for am, sd or hm respectively % array -> array to perform calculations % Output: % ret_val -> calculated value of am, sd or hm arr_size = length(array); % Error checking... if(isempty(array) || 1 > arr_size) error( "Array must contain more then one number.\r\n" ); end if(isempty(operation) || 1 ~= length(operation)) error( "Operation must be singe value.\r\n" ); end if((3 < operation) ||(1 > operation)) error( "Operation range is [1 3]\r\n" ); end % Calculations: sumX = 0; tmp = 0; if(1 == operation) for i = 1:arr_size sumX = sumX + array(i); end ret_val = sumX/arr_size; elseif(2 == operation) for i = 1:arr_size sumX = sumX + array(i); end meanX = sumX/arr_size; for i = 1:arr_size tmp = tmp + (array(i) - meanX)^2; end ret_val = tmp/(arr_size - 1); elseif(3 == operation) for i = 1:arr_size sumX = sumX + 1/array(i); end ret_val = arr_size/sumX; else error( "Operation value error.\r\n" ); end end % ASH 
wavelegths=[0.7800 0.6949 0.6559 0.5843 0.5206 0.4914 0.4378]; freq=[440.0 493.9 523.2 587.3 659.3 698.5 784.0]; plot(wavelegths.^(-1),freq) xlabel('Wavelength^{-1}') ylabel('Frequency') M=0.2; G=9.8; R=input("Enter Radius: "); v=sqrt(G*R); fprintf('\n Minimum Speed to avoid falling down is %f m/sec\n',v) while(1) z=input('Enter RD to convert Radians to Degrees or DR for Degress to Radians:','s'); if(strcmp(z,'RD')) r=input('Enter angle values in Radians:'); fprintf('\nValue in Degrees:') d=r*180/pi elseif(strcmp(z,'DR')) d=input('Enter angle values in Degrees:'); fprintf('\nValue in Radians:') r=d*pi/180 elseif(isempty(z)) break; else fprintf('Wrong Input\n') end end while(1) n=input('Enter Name:','s'); add=input('Enter address:','s'); a=input('Enter amount of purchase: $'); z=input('Enter type of purchase(L for Laptop/D for Desktop):','s'); if(z=='L') if(a>=0 && a<=250) d=0; elseif(a>250 && a<=570) d=5; elseif(a>500 && a<=1000) d=7.5; elseif(a>1000) d=10; else fprintf('Wrong Amount\n') continue end elseif(z=='D') if(a>=0 && a<=250) d=5; elseif(a>250 && a<=570) d=7.6; elseif(a>500 && a<=1000) d=10; elseif(a>1000) d=15; else fprintf('Wrong Amount\n') continue end else fprintf('\nWrong Input\n') continue end final_amount=a-(a*d/100); fprintf('\nName: %s',n) fprintf('\nAddress: %s',add) fprintf('\nNet Amount:$%f',final_amount) k=input('\nDo you want to continue purchase:','s'); if(k~='y'&&k~='Y') break; end end fprintf('\nYou have exit purchase screen, goodbye\n')